跟读练习: Biodiesel: The afterlife of oil - Natascia Radice - 通过YouTube学习英语口语
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Just a minute ago, this oil helped make a delicious meal possible.
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Just a minute ago, this oil helped make a delicious meal possible.
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But now, it's just some nasty goop.
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What should we do with it?
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Well, the easiest thing would be to pour it down the drain; that makes it seem like it's gone, but it's not really gone.
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Instead, it's collecting bits of food and other random stuff, producing monstrous, greasy blockages that clog not only your own drain but entire sewage systems, causing flooding and pollution.
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Many places have laws for proper disposal of grease, but we can go one step further.
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Instead of just throwing it away safely, we can turn it into something useful.
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And if you're wondering what anyone could possibly want with a bunch of digusting, used cooking oil, the answer is: biodiesel.
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You've probably heard of diesel engines.
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They power farming and construction equipment, trucks, buses, ships, trains, backup generators, and even some cars.
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Most of the fuel that feeds these engines is refined from petroleum, which comes from long-dead dinosaurs and other ancient fossils.
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But diesel fuel can also be derived from more recently-dead organisms, like plants and animals.
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And this type of fuel is what we call biodiesel.
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Biodiesel is a biodegradable energy source, made from plant oils or animal fats, that can usually be burned in regular diesel engines.
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You guessed it, it's the 'bio' version of diesel.
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It's cleaner than normal diesel, so there has been a push to generate it from crops like soybeans.
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Now, growing plants for fuel, instead of food, comes with its own problems.
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But fortunately, we already have some oils and fats right here.
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Preparing your used cooking grease for recycling is easy.
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First, let it cool down to room temperature.
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Then, transfer it to a clean container.
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You can use any old bottles you have lying around, like milk jugs, as long as they're completely empty, rinsed, and dried.
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Use a funnel to avoid spills and a sieve to filter out any small food particles.
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You can even add bacon grease and other animal fats or the excess oil from canned food, like tuna or sardines, just make sure it's really oil and not brine.
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So, what happens now that your oil is safely contained?
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Well, many cities have recycling services that will pick up large amounts of grease from restaurants and other establishments.
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But there are locations where individuals can drop off their containers, as well.
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All of this grease will end up at a processing plant, where it can be converted to useable biodiesel.
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How does this conversion work?
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Well, all these oils and fats you donated are made up of triglycerides, a glycerol molecule connected to three fatty acid chains.
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To convert fats to fuel, they react with an alcohol, usually methanol or ethanol, which produces long-chain esters and glycerol.
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To compare, here are some molecules of regular diesel fuel.
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Now, here are the molecules we created by breaking apart the triglycerides.
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Glycerol is the odd man out, so it's removed at the end of the process.
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But look at these esters!
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If you squint, their structures look pretty similar to those of the long-chain hydrocarbons in regular diesel.
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And diesel engines, with a few small modifications, can also be made to squint and burn these esters like regular diesel fuel.
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Et voila! Biodiesel.
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Now, you might be wondering whether all this hassle over recycling used cooking oil is even worth it.
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After all, how much energy can it possibly generate?
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Well, if all the grease that New Yorkers throw away in one day were converted to jet fuel, it would be enough to power several hundred flights from New York to Los Angeles.
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And let's not forget that using waste oil instead of burning more fossil fuels will limit our negative effects on the environment.
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Recycling used cooking grease turns goop into good.
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By contributing a little bit, individuals and businesses can help create an alternative, stable source of diesel oil, while protecting the environment and keeping our cities cleaner.
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And that's pretty slick.
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背景与语境
在这段视频中，演讲者Natascia Radice讨论了废弃食用油的处理方法。她强调了将使用过的油脂转换为生物柴油的重要性，这不仅解决了废油的处置问题，还能为环境保护做出贡献。通过这个话题，观众可以了解到如何利用厨房里常见的废油来创造一种可持续的能源，从而减少对化石燃料的依赖。
日常交流中的五个常用短语
- What should we do with it?（我们该怎么处理它？）
- It's just some nasty goop.（这只是一些难看的粘稠物。）
- Preparing your used cooking grease for recycling is easy.（准备将你的废弃食用油进行回收是简单的。）
- Biodiesel is a biodegradable energy source.（生物柴油是一种可生物降解的能源。）
- Recycling used cooking grease turns goop into good.（回收废弃食用油可以将糊状物变成有用的东西。）
逐步跟随指南
在观看这段视频时，您可以通过“shadow speak”练习来提高您的英语发音。以下是一个简单的步骤指南，帮助您更好地理解和模仿演讲者：
- 仔细听：首先，观看视频并认真听取演讲者的语音和语调。
- 逐句跟读：使用“shadowspeak”技巧，暂停视频并重复每一句话，尽量模仿演讲者的发音和节奏。比如，当听到“What should we do with it?”时，暂停并跟读。
- 分段练习：将视频分成小段落，每个段落练习几次，直到您感觉自然为止。
- 录音对比：录下自己的声音，与原始视频进行对比，看看自己在发音和语调上有哪些差距。
- 运用到生活中：尝试将学到的短语应用到日常对话中，特别是在与朋友讨论环境保护或食品安全时。
通过这个过程，您将能够更有效地进行口语练习，为雅思口语练习打下更坚实的基础，同时也在“看YouTube学英语”的过程中提高您的英语发音能力。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。