跟讀練習: Black Holes Explained – From Birth to Death - 通過影片學習英語口語
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Black holes are one of the strangest things in existence.
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They don't seem to make any sense at all.
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Where do they come from?
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And what happens if you fall into one?
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Bye.
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Stars are incredibly massive collections of mostly hydrogen atoms that collapse from enormous gas clouds under their own gravity.
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In their core, nuclear fusion crushes hydrogen atoms into helium, releasing a tremendous amount of energy.
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This energy, in the form of radiation, pushes against gravity, maintaining a delicate balance between the two forces.
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As long as there is fusion in the core, a star remains stable enough.
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But for stars with way more mass than our own Sun, the heat and pressure at the core allow them to fuse heavier elements until they reach iron.
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Unlike all the elements that went before, the fusion process that creates iron doesn't generate any energy.
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Iron builds up at the center of the star until it reaches a critical amount, and the balance between radiation and gravity is suddenly broken.
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a fraction of a second, the star implodes, moving at about a quarter of the speed of light, feeding even more mass into the core.
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It's at this very moment
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that all the heavier elements in the universe are created as the star dies in a supernova explosion.
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This produces either a neutron star, or if the star is massive enough, the entire mass of the core collapses into a black hole.
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If you looked at a black hole, what you'd really be seeing is the event horizon.
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Anything that crosses the event horizon needs to be traveling faster than the speed of light to escape.
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In other words, it's impossible.
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So we just see a black sphere, reflecting nothing.
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But if the event horizon is the black part, what is the whole part of the black hole?
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The singularity.
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We're not sure what it is exactly.
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A singularity may be infinitely dense, meaning all its mass is concentrated into a single point in space, with no surface or volume.
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Or something completely different.
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Right now, we just don't know.
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It's like a dividing by zero error.
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things up like a vacuum cleaner.
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If we were to swap the Sun for an equally massive black hole, nothing much would change for Earth, except that we would freeze to death, of course.
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What would happen to you if you fell into a black hole?
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The experience of time is different around black holes.
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From the outside, you seem to slow down as you approach the event horizon, so time passes slower for you.
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At some point, you would appear to freeze in time, slowly turn red, and disappear.
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While from your perspective, you can watch the rest of the kind of like seeing into the future.
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Right now, we don't know what happens next, but we think it could be one of two things.
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One, the end.
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You die a quick death.
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A black hole curves space so much that once you cross the event horizon, there is only one possible direction.
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You can take this literally inside the event horizon.
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You can only go in one direction.
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It's like being in a really tight alley that closes behind you after each step.
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The mass of a black hole is so concentrated, at some point even tiny distances of a few centimeters,
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would mean that gravity acts with millions of times more force on different parts of your body.
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and more until you're a hot stream of plasma one atom wide.
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Two, you die a very quick death.
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Very soon after you cross the event horizon, you would hit a firewall and be terminated in an instant.
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Neither of these options are particularly pleasant.
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How soon you would die depends on the mass of the black hole.
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A smaller black hole would kill you before you even entered its event horizon, while you probably could travel inside a supermassive black hole for quite a while.
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As a rule of thumb, longer you live.
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Black holes come in different sizes.
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There are stellar mass black holes, with a few times the mass of the Sun and the diameter of an asteroid.
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And then there are these supermassive black holes, which are found at the heart of every galaxy and have been feeding for billions of years.
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Currently, the largest supermassive black hole known is S50014 +81,
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40 billion times the mass of which is 47 times the distance from the Sun to Pluto.
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As powerful as black holes are, they will eventually evaporate through a process called Hawking radiation.
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To understand how this works, we have to look at empty space.
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Empty space is not really empty, but filled with virtual particles popping into existence and annihilating each other again.
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When this happens right on the edge of a black hole, one of the virtual particles will be drawn into the black hole, and the other will escape and become a real particle.
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So the black hole is losing energy.
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This happens incredibly slowly at first, and gets faster as the black hole becomes smaller.
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When it has the mass of a mountain, it radiates with about the heat of our sun, and in the last second of its life, the black hole radiates away with the energy of billions of nuclear bombs in a huge explosion.
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But this process is incredibly slow.
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The biggest black holes we know might take up to a googol years to evaporate.
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This is so long that when the last black hole radiates away, nobody will be around to witness it.
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The universe will have become uninhabitable long before then.
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This is not the end of our story.
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There are loads more interesting ideas about black holes.
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We'll explore them in part two.
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A big thanks to Fraser Cain for help with this video.
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By the way, we've made some Kurzgesagt wallpaper in 4K for different screen sizes.
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You can get them on our Patreon page, which also helps us to make more videos.
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Like this December, the first month ever with 3 videos.
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背景與上下文
在我們探討如何通過英語影子跟讀來提高發音能力之前，瞭解話題的背景至關重要。本影片的主題是黑洞，從它們的形成到死亡，內容複雜且具有挑戰性。然而，通過影子跟讀技術，學習者可以更輕鬆地把握科學英語的表達方式與理解。在觀看影片的過程中，英語學習者不僅能獲得科學知識，還能提高他們的語言能力，特別是在理解和模仿地道發音方面。
日常交流的五個常用短語
- 黑洞是存在中最奇特的事物之一。 (Black holes are one of the strangest things in existence.)
- 星星在其核心進行核聚變。 (Stars undergo nuclear fusion in their cores.)
- 超新星爆炸中創造了宇宙中的重元素。 (Heavier elements in the universe are created in a supernova explosion.)
- 越靠近奇點，你的生命越短。 (The closer you get to the singularity, the shorter your life will be.)
- 黑洞的質量是如此集中。 (The mass of a black hole is so concentrated.)
逐步影子跟讀指南
以下是一些步驟，幫助你通過shadow speak的形式改善發音和理解能力，特別是對於像本影片這樣複雜的主題。
- 觀看影片的一部分，專注於講者的語音語調和語速。
- 暫停影片，嘗試重複講者的每一句話，注意發音和重音。此時可以使用shadowspeaks技術，提高英語發音。
- 回放特定段落，繼續模仿講者的語音，確保你在反覆練習中掌握每個詞彙。
- 記錄自己的發音，與影片中的講者進行比較，找出需要改進的地方。
- 完成影片後，嘗試用自己的話總結內容，確保你能夠以流利的英語表達出主題的要點。
運用這些方法，你將能夠更有效地進行英語影子跟讀，提升你的語言能力。記住，規律的練習將使你在學習過程中受益匪淺，成為更自信的英語交流者。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。