シャドーイング練習: Semiconductors explained in 16 mins | Chris Miller - 動画で英語スピーキングを学ぶ
レッスンを作成中...
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When I started my research on semiconductors, I thought that because chips were everywhere, chips were easy to make, and because nuclear bombs were only controlled by a handful of governments, they were hard to make.
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But what I realized is actually the exact opposite.
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If you take nuclear weapons, that technology has barely improved since the 1960s.
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But chips are everywhere because they're cheap and they're tiny.
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And making things very inexpensive and very small is extraordinarily difficult, which is why there's just a couple companies in the world that can do it.
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And it's done so not just for a couple years, it's done so now for over half a century.
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And that's why when you compare progress in the computing industry to progress anywhere else, there's really no comparison.
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I'm Chris Miller, a professor at the Fletcher School and author of Chip War, the fight for the world's most critical technology.
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Semiconductors 101.
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Well, chip is a piece of silicon, often the size of your fingernail, And in it is carved thousands or millions, in some cases, billions of tiny devices called transistors,
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which flip circuits on or off, on and off.
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And when they're on, they produce a one.
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When they're off, they produce a zero.
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And all of the ones and zeros undergirding computing, undergirding data storage, all of your Instagram likes, all of your text messages, these are all just long strings of ones and zeros,
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which are created on the chip by these circuits flipping on and off.
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There are a couple of different categories of chips.
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Some chips process data.
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Other chips remember data.
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And the third category turns real world signals, like audio or pictures, into ones and zeros so that they can then be processed or remembered.
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And so when we look at the world, we see pictures.
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But when a phone, for example, uses a camera to look at the world, it takes in lots of rays of light
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and then has to learn how to convert those into ones and zeros that can be stored.
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And so there's very specific sensors for pictures,
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for sound, for radio waves that are used semiconductors to convert these real-world signals into strings
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and ones of zeros that can then be re-represented as pictures later on, for example, when you pull a photo op on your phone.
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All of this is done by different types of semiconductors.
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So generally chips have a foundation of silicon, but there are dozens of other materials that are layered on top to make the transistors at such tiny scale.
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So a typical advanced chip could have several dozen materials.
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The foundation is silicon, but there are many other chemicals involved in the process.
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Yeah, it's true that sand is from silicon and so are chips, but the similarities basically end there.
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The silicon that's used in manufacturing chips is among the most purified elements that we have.
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And the reason is that when you're manufacturing chips with tiny transistors, you need to place almost every atom perfectly to make those chips work,
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which means that if your silicon or any of the other materials that you're using has even a single atomic impurity.
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It can cause defects in the way your chip functions.
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And so the production of the silicon wafers that are used in the chip manufacturing process requires extraordinary levels of purity.
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There's really just four companies in the world today
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that are capable of producing silicon wafers at the right level of purity at the scale that's required for contemporary manufacturing.
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The good news is that there's silicon everywhere.
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It's one of the most widely distributed elements in the Earth's crust.
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The hard part is really the refining
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and the purification of silicon to make sure there aren't any impurities that could disrupt the manufacturing process.
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So on top of your silicon, you could have boron, gallium, gallium arsenide, lots of different chemicals that are used.
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And every chipmaker has its own proprietary process.
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So we don't really know inside of a typical chip what materials are used because chipmakers usually keep it pretty secretive.
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That's their special sauce that lets them manufacture chips with the right level of capability.
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We're not going to run out of silicon nor will we run out of the other materials
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that are generally used in chip making.
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There are some concerns that certain materials are predominantly are refined and processed in a single country.
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So for some of the materials like gallium and germanium, China produces around 90 percent of those materials.
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So there's geopolitical issues that could interrupt supply
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but it's not going to be that we're running out of the capability to to produce them.
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Yeah, I visited a bunch of chip making facilities over the course of the research.
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The interesting thing though is that when you go inside one of these massive facilities called fabs, what you find is that there are huge machines
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and not much else because the manufacturing process has to be extraordinarily automated
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because humans are way too imprecise for manufacturing at nanometer scale.
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And so inside of a chip making facility, there are very few humans and lots of big machines that from the outside are impressive in their size,
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but you can't see what's actually happening because it's happening at microscopic level.
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So there are a handful of companies that play a big role in the making of the machines that make chips.
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A couple in the United States, one in the Netherlands, and one other large one in Japan.
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Five companies play the dominant role in the manufacture of the machines that make chips.
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And in some ways it's actually harder to make the machines
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that make chips than it is to to make the chips themselves, because these tools are among the most precise tools that have ever been deployed.
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Just to give you one example, ASML, a company based in the Netherlands, produces machines that are used in the manufacture of almost every high-end chip today.
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These machines are capable of manipulating materials at basically the atomic level to produce chips with billions and billions of transistors,
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like those that are inside of your phone or that are used for training AI systems.
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So there's a pretty small number of companies that make chips.
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And when you look at specific types of chips, you find that there's even more concentration.
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The biggest chip maker in the world is the Taiwan Semiconductor Manufacturing Company.
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And when it comes to advanced processor chips, like the chips in your phone or the chips in your computer, TSMC makes around 90% of them.
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So they've got an extraordinary market share
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and are probably the most important semiconductor company
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and arguably the most important company in the world because the chips that they produce, we rely on for basically everything.
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There's been a lot of consolidation in the chip industry over the past couple of decades, and it's been driven by economics and by technology.
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Today a single cutting edge chip making facility costs $20 billion.
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The most expensive factories in all of human history.
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And so there's just a couple of companies
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that can afford to put up that sum of money on a regular basis to build more and more cutting edge facilities.
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And to make that work financially, you've got to produce a ton of chips.
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And so there are huge benefits that accrue to the largest firms.
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The more chips you produce, the more your cost structure makes sense, and the better your technology gets because you learn from every chip you manufacture, you gather data from it,
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and you tweak your manufacturing process to make sure you've got fewer and fewer impurities at every step.
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And so TSMC is both the world's largest chip maker, but it's also the world's most advanced precisely because it gathers more data than anyone else.
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Because chip making requires ultra-purified materials and hugely complex equipment, there's not a single company that can do it on its own.
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Taiwan requires a set of partnerships with supply chain providers to give them the materials
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and the intellectual property and the software and the tools that they need to produce advanced chips.
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And so if you take, for example, the primary processor inside of your smartphone, it was probably made in Taiwan,
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but it was made in Taiwan using chip making tools from the Netherlands and from the United States and from Japan.
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It was produced using chemicals from Japan and then often assembled and packaged in Malaysia before ending up inside of your smartphone.
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And that's typical.
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A typical chip requires components and materials sourced from dozens of different companies
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because the process is simply too hard for any one company to do on its own.
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So a nanometer is a billionth of a meter, and chips today are measured in nanometers.
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If you look at the chip inside of your phone, for example, and try to measure the size of the transistors, of which there will be billions on your smartphone chip,
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Each one of these will be measured in a handful of nanometers.
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And so that makes them only slightly larger than atoms, smaller than any sort of living thing, far smaller than a bacteria,
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smaller than a mitochondria, half the size for the most cutting edge transistors of a coronavirus.
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There's basically nothing we manufacture at such tiny scale as we do with semiconductors.
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Every year we make more transistors than we've made all other goods combined in all of human history.
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And in fact, nothing else really comes close.
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A typical smartphone chip could have 10 billion transistors just in the main processor chip.
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A big data center run by Google or Amazon Web Services would have more transistors than you could plausibly count.
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We know that we make more transistors than there are cells in the human body, for example.
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We don't even know how many we make in aggregate because there are just so many.
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Moore's law predicts that the number of transistors per chip
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and as a result the computing power per chip will double every couple of years.
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And that's been empirically true since the 1960s, which means that the capabilities of chips have gotten vastly better and continue to get much,
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much better at a faster rate than anything else.
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So I like to think, for example, of airplanes to illustrate the difference.
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If airplanes doubled in speed every two years from the 1960s up to the present, we'd be flying faster literally than the speed of light.
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But chips have done that.
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Chips have increased in that capability because the scale of the transistors has shrunk to the level that today we're manufacturing them, smaller than even viruses.
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And that has enabled the explosion of computing power, both in terms of the computing capabilities in high-powered data centers or in your phone,
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but also the application of computing to all sorts of devices.
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Because today there's computing everywhere.
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It's in your dishwasher, it's in your refrigerator, it's in your coffee maker, it's in your car.
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It's possible to put computing everywhere because today it's so cheap.
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We can produce it almost for free.
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And that has enabled the application of chips to all sorts of different devices.
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To understand the change and the rate of innovation, in the 1950s you could hold a single transistor in your hand.
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Today you can hold 10 billion transistors in your hand in a chip that's the size of your fingernail.
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And that's not an expensive chip.
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That's a chip that often will just cost $50 or so.
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So the rate of shrinking transistors as well as the rate
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of decline in their cost has been unparalleled in any other segment of the economy.
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So before transistors, computers used vacuum tubes, which were sort of light bulb-like devices that would turn on and off, on and off to produce the ones and zeros.
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And they were cutting edge for their time, but they had huge inefficiencies.
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They wasted a lot of heat, for example.
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They worked pretty slowly.
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And they also, because they created light, attracted moths.
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And so computers had to be regularly debugged in the early days of computing, which meant removing moths from the lights that they were attracted to.
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You can see why it was hard to scale that up into a 10 billion unit system.
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You know, I think the transistor is the key reason why we've been able to scale down.
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There's really nothing else, if you look all across the economy, that has shrunk in size and shrunk in cost at that level.
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And it's done so not just for a couple years, it's done so now for over half a century.
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And that's why when you compare progress in the computing industry to progress anywhere else there's really no comparison.
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Well Moore's law is not a law of nature, it's not a law of physics.
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We wish it were because then we could rely on it to keep delivering advances far into the future, but it's really a law of economics.
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It says that if you're able to find a way to shrink, shrink your transistors smaller, then you will be able to find a larger market as well.
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And that has incentivized huge investments in shrinking, in improving manufacturing processes, and making chemicals more purified to enable it,
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which has sustained this rate of advance.
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And if ever it turns out that the economics are on Moore's Law break down, the technology will immediately break down as well.
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Thankfully, the good news is that right now we're seeing a new wave of excitement about ways you can deploy computing,
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which has led to a surge of new investment into AI, but also a surge of new investment into semiconductors, because it's now clear that
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if we can shrink even further will enable a whole new era of advances in artificial intelligence
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that rely on even more computing that we've been able to muster thus far.
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You can define Moore's law in a bunch of different ways.
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Is it based on the 2D size of the transistor or the 3D size of the transistor?
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Is it based on the processing speed that comes out of it?
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And I think there's a lot of people in the industry
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that are trying to sell a certain chip with given characteristics that have an incentive to say Moore's law, based on the other characteristics, has come to a halt.
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If you look at the rate of increase of machine learning semiconductors, for example, chips that are optimized for AI capabilities,
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they've been doubling in their capability every two years for the past decade or so.
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In other words, exactly what Gordon Moore predicted when he set out Moore's law in 1965.
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And so my view is that when you zoom out and look at the rate of technological progress, there's really no slowdown that's happening.
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When I started my research on semiconductors, I thought that because chips were everywhere, chips were easy to make, and because nuclear bombs were only controlled by a handful of governments, they were hard to make.
156
But what I realized is actually the exact opposite.
157
If you take nuclear weapons, that technology has barely improved since the 1960s.
158
It's so easy to make nuclear bombs, even the North Koreans can do it.
159
But chips are everywhere because they're cheap and they're tiny.
160
And making things very inexpensive and very small is extraordinarily difficult, which is why there's just a couple companies in the world that can do it at the cutting edge.
161
And the reason is that it's brutally expensive and it requires manufacturing processes
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that get better and better and better every single year.
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And so if you're trying to catch up to the cutting edge in the chip industry, you're not trying to catch up to a static cutting edge.
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You're trying to catch up to a cutting edge that is racing forward at the rate of Moore's law, doubling every two years.
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And so it's a race between companies, but it's the fastest race humans have ever undertaken, which is why it's extraordinarily difficult to reach the cutting edge.
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A couple of years ago, it became harder to shrink transistors in two-dimensional format.
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For a long time, chips were made, they were described as planar chips, chips in a plane in which all the transistors were on the same level.
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Now we've started making transistors that have three dimensions
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because we're learning to stack them on top of each other to package more of them together in a way
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that produces more computing power. And
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so one of the key trends over the next couple of
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years is going to be more 3D construction of groups of transistors
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which will enable more of them to be crammed into a small amount of space.
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So the machines that make chips are extraordinarily precise in their manufacturing.
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For example, there are tools that can lay down thin films of material
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that are just a a couple of atoms thick with basically perfect uniformity.
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And to pattern the transistors on a piece of silicon, you use a tool called a lithography tool.
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And today there's one company, ASML of the Netherlands, which makes most of the world's lithography tools.
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And for the most advanced chips, these tools can cost $350 million a piece for a single tool.
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And they cost so much because they require some of the most precise components ever used, a mirror that's the flattest mirror humans have ever made,
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a laser that's the most powerful laser ever deployed in a commercial device, and a ball of tin that falls through a vacuum
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and is struck twice by that laser explodes into a plasma measuring 40 times the temperature of the surface of the sun.
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And this plasma emits light at just the right wavelength, 13.5 nanometers to be bounced off the mirrors in exactly the right geometry
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and land on your chip to carve the transistors into the silicon.
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It's the most complex and expensive machine that humans have ever made, and it's required to make all of the most advanced chips.
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Today there are just three companies capable of producing cutting-edge processor chips, the types of chips that go in phones or computers or are used for AI.
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And it used to be a larger number of companies that could produce at the cutting edge, but it's shrunken to three and might in the future shrink only to two for two reasons.
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First, the expense is extraordinary.
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$20 billion per facility is a level of spending that many governments can't afford to say nothing of companies.
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But second, the scale required to manufacture efficiently is vast.
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And that means that the benefits accrue to the largest firm.
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And in this case, that's TSMC, the Taiwanese firm that's at the center of the chip industry.
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That's why they manufacture around 90% of the most advanced chips, because they're cheaper and they're better than their competitors when it comes to manufacturing.
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このレッスンの語彙とスピーキングのポイント
このC1レベルのスピーキングレッスンは、動画「Semiconductors explained in 16 mins」を教材にしています。 繰り返し出てくる語は次のとおりです：chip, transistor, silicon, manufacturing, produce。 この動画には、シャドーイング用の文が193文、単語が3205語あります。 音声の長さは16:19です。 話す速さは速く、1分あたり約196語です。音のつながりや弱く発音される音が多くなります。 英語の頻出3,000語に含まれる単語は81%だけなので、語彙は難しめです。
この動画の重要語彙
動画の中で特に難しい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| transistor 名詞 | /tɹænˈzɪs.tɚ/ | トランジスタ |
| silicon 名詞 | /ˈsɪləˌkɑn/ | ケイ素, 珪素 |
| compute 動詞 | /kəmˈpjuːt/ | 計算する |
| semiconductor 名詞 | /ˌsɛmikənˈdʌktə/ | 半導体 |
| capability 名詞 | /ˌkeɪ.pəˈbɪl.ɪ.ti/ | 能力 |
| smartphone 名詞 | /ˈsmɑɹtfoʊn/ | スマートフォン, スマートホン |
| gallium 名詞 | /ˈɡæliəm/ | ガリウム |
| impurity 名詞 | /ɪmˈpjɝɪti/ | 不純, 汚れ |
| deploy 動詞 | /dɪˈplɔɪ/ | 配置する |
| atom 名詞 | /ˈætəm/ | 原子, アトム |
| fingernail 名詞 | /ˈfɪŋɡɚˌneɪl/ | 爪, ツメ |
| lithography 名詞 | /lɪθˈɒɡɹəfi/ | リトグラフ |
| moth 名詞 | /mɔθ/ | 蛾 |
| nanometre 名詞 | /ˈnænoʊˌmitər/ | ナノメートル |
| wafer 名詞 | /ˈweɪ̯fɚ/ | ウエハース |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| lie down 動詞 | 横になる, 臥す | |
| zoom out 動詞 | /ˌzuːm ˈaʊt/ | ズームアウトする, 縮小する |
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | have ever been deployed · we've made · have gotten |
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | were only controlled · is carved · are created |
| 関係詞節 who / which + 節 — 人や物について情報を加える | difficult, which is · tubes, which were · undertaken, which is |
注意したい発音
話し手はthey're, you're, we'reなど、短縮形や弱形を34回使っています。聞こえたとおりの短い形で発音しましょう。
- 「th」の音: lithography /lɪθˈɒɡɹəfi/, moth /mɔθ/, billionth /ˈbɪl.i.ənθ/
- 「sh」と「zh」の音: dishwasher /ˈdɪʃˌwɑʃɚ/, purification /ˌpjʊəɹɪfɪˈkeɪʃən/, consolidation /kənˌsɑləˈdeɪʃən/, dimension /daɪˈmɛn.ʃən/, dimensional /daɪˈmɛn.ʃə.nəl/
- 長い単語（アクセントの位置に注意）: semiconductor /ˌsɛmikənˈdʌktə/, capability /ˌkeɪ.pəˈbɪl.ɪ.ti/, lithography /lɪθˈɒɡɹəfi/, nanometre /ˈnænoʊˌmitər/, inexpensive /ˌɪnɪkˈspɛnsɪv/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: lithography /lɪθˈɒɡɹəfi/, airplane /ˈɛɹˌpleɪ̯n/, similarity /ˌsɪm.ɪˈlæɹ.ɪ.ti/, illustrate /ˈɪl.əˌstɹeɪt/, predominantly /pɹɪˈdɒmɪnəntli/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: inexpensive /ˌɪnɪkˈspɛnsɪv/, vacuum /ˈvæ.kjuːm/, coronavirus /kəˈɹoʊnəˌvaɪɹəs/, incentivize /ɪnˈsɛntɪvaɪz/, vastly /ˈvæstli/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: smartphone /ˈsmɑɹtfoʊn/, purify /ˈpjʊɹɪfaɪ/, fingernail /ˈfɪŋɡɚˌneɪl/, lithography /lɪθˈɒɡɹəfi/, wafer /ˈweɪ̯fɚ/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。transistor, silicon, computeなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。