跟读练习: Nuclear Energy Explained: How does it work? 1/3 - 通过YouTube学习英语口语
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Have you ever been in an argument about nuclear power?
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Have you ever been in an argument about nuclear power?
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We have, and we found it frustrating and confusing, so let’s try and get to grips with this topic.
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[Intro] It all started in the 1940s.
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After the shock and horror of the war and the use of the atomic bomb, nuclear energy promised to be a peaceful spin-off of the new technology, helping the world get back on its feet.
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Everyone’s imagination was running wild.
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Would electricity become free?
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Could nuclear power help settle the Antarctic?
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Would there be nuclear-powered cars, planes, or houses?
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It seemed that this was just a few years of hard work away.
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One thing was certain: the future was atomic.
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Just a few years later, there was a sort of atomic age hangover; as it turned out, nuclear power was very complicated and very expensive.
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Turning physics into engineering was easy on paper, but hard in real life.
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Also, private companies thought that nuclear power was much too risky as an investment; most of them would much rather stick with gas, coal, and oil.
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But there were many people who didn’t just want to abandon the promise of the atomic age; an exciting new technology, the prospect of enormously cheap electricity, the prospect of being independent of oil and gas imports, and, in some cases, a secret desire to possess atomic weapons provided a strong motivation to keep going.
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Nuclear power’s finest hour finally came in the early 1970s, when war in the Middle East caused oil prices to skyrocket worldwide.
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Now, commercial interest and investment picked up at a dazzling pace.
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More than half of all the nuclear reactors in the world were built between 1970 and 1985.
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But which type of reactor to build, given how many different types there were to choose from?
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A surprising underdog candidate won the day: the light water reactor.
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It wasn’t very innovative, and it wasn’t too popular with scientists, but it had some decisive advantages: it was there, it worked, and it wasn’t terribly expensive.
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So, what does a light water reactor do?
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Well, the basic principle is shockingly simple: it heats up water using an artificial chain reaction.
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Nuclear fission releases several million times more energy than any chemical reaction could.
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Really heavy elements on the brink of stability, like uranium-235, get bombarded with neutrons.
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The neutron is absorbed, but the result is unstable.
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Most of the time, it immediately splits into fast-moving lighter elements, some additional free neutrons, and energy in the form of radiation.
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The radiation heats the surrounding water, while the neutrons repeat the process with other atoms, releasing more neutrons and radiation in a closely controlled chain reaction.
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Very different from the fast, destructive runaway reaction in an atomic bomb.
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In our light water reactor, a moderator is needed to control the neutrons’ energy.
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Simple, ordinary water does the job, which is very practical, since water’s used to drive the turbines anyway.
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The light water reactor became prevalent because it’s simple and cheap.
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However, it’s neither the safest, most efficient, nor technically elegant nuclear reactor.
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The renewed nuclear hype lasted barely a decade, though; in 1979, the Three Mile Island nuclear plant in Pennsylvania barely escaped a catastrophe when its core melted.
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In 1986, the Chernobyl catastrophe directly threatened Central Europe with a radioactive cloud, and in 2011 the drawn-out Fukushima disaster sparked new discussions and concerns.
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While in the 1980s 218 new nuclear power reactors went live, their number and nuclear’s global share of electricity production has stagnated since the end of the ’80s.
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So what’s the situation today?
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Today, nuclear energy meets around 10% of the world’s energy demand.
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There are about 439 nuclear reactors in 31 countries.
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About 70 new reactors are under construction in 2015, most of them in countries which are growing quickly.
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All in all, 116 new reactors are planned worldwide.
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Most nuclear reactors were built more than 25 years ago with pretty old technology.
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More than 80% are various types of light water reactor.
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Today, many countries are faced with a choice: the expensive replacement of the aging reactors, possibly with more efficient, but less tested models, or a move away from nuclear power towards newer or older technology with different cost and environmental impacts.
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So, should we use nuclear energy?
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The pro and contra arguments will be presented here next week.
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关于本课程
本课程旨在帮助学习者通过分析和练习核能的相关内容，提升自己的英语口语能力。视频讲解了核能的历史、基本原理以及目前的应用情况，让学习者不仅能提高语言技巧，同时也能拓宽对核能技术的理解。在练习过程中，学习者将涉及到科学技术相关的术语和句型，这将提升他们在专业领域的交流能力。
关键词汇和短语
- 核能 (nuclear energy)
- 核反应堆 (nuclear reactor)
- 链式反应 (chain reaction)
- 放射性 (radiation)
- 中子 (neutron)
- 铀-235 (uranium-235)
- 光水反应堆 (light water reactor)
- 能源需求 (energy demand)
练习技巧
在观看关于核能的视频时，学习者可以运用shadowspeak的技巧进行口语练习。建议学习者模仿视频中的语速和语调，以提高自己的自然发音。视频的语速适中，适合进行英语口语练习。在第一遍观看后，尝试关闭声音，自己进行复述，增强对内容的掌握和记忆，这个过程被称为shadow speech。通过不断的跟读和自我纠正，学习者可以逐步提升语言流利度。在此过程中，务必注意科学术语的准确发音，这对将来的专业交流至关重要。最后，鼓励使用看YouTube学英语的方法，反复观看并练习，强化对核能这一主题的理解和表达。
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。