跟读练习: What light can teach us about the universe - Pete Edwards - 通过YouTube学习英语口语
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How and when did our universe begin?
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How and when did our universe begin?
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How did it get to look like this?
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How will it end?
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Humans have been discussing these questions for as long as they've been around without ever reaching much agreement.
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Today, cosmologists are working hard to find the answers.
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But how can anyone hope to find concrete answers to such profound questions?
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And how is it possible to explore and study something as huge as the universe, most of which we'll never be able to reach?
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The answer is light.
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And although light from distant parts of the universe can take billions of years to reach us, it carries six unique messages that, when put together, can disclose an amazing amount of information to astronomers who know how to look for it.
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Just as sunlight can be split up into the familiar rainbow, splitting the light from distant objects exposes different patterns of colors depending on its source.
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This distinctive light barcode can reveal not only an object's composition, but also the temperature and pressure of its constituent parts.
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There's even more we can discover from light.
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If you've ever stood on a train platform, you might have noticed that the train sounds different depending on its direction with the pitch ascending when it approaches you and descending when it speeds away.
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But this isn't because the train conductor is practicing for a second career.
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Rather, it's because of something called the Doppler effect where sound waves generated by an approaching object are compressed, while those from a receding object are stretched.
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But what has this to do with astronomy?
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Sound does not travel through a vacuum. In space, no one can you hear you scream!
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But the same Doppler effect applies to light whose source is moving at exceptional speed.
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If it's moving towards us, the shorter wavelength will make the light appear to be bluer.
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While light from a source that's moving away will have a longer wavelength, shifting towards red.
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So by analyzing the color pattern in the Doppler shift of the light from any object observed with a telescope, we can learn what it's made of, how hot it is and how much pressure it's under, as well as whether it's moving, in what direction and how fast.
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And these six measurements, like six points of light, reveal the history of the universe.
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The first person to study the light from distant galaxies was Edwin Hubble, and the light he observed was redshifted.
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The distant galaxies were all moving away from us, and the further away the were, the faster they were receding.
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Hubble had discovered our universe is expanding, providing the first evidence for the Big Bang theory.
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Along with the idea that the visible universe has been constantly expanding from a densely packed single point, one of this theory's most important predictions is that the early universe consisted of just two gases: hydrogen and helium, in a ratio of three to one.
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And this prediction can also be tested with light.
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If we observe the light from a remote, quiet region of the universe and split it, we do indeed find the signatures of the two gases in just those proportions.
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Another triumph for the Big Bang.
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However, many puzzles remain.
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Although we know the visible universe is expanding, gravity should be applying the brakes.
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But recent measurements of light from distant dying stars show us that they're farther away than predicted.
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So the expansion of the universe is actually accelerating.
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Something appears to be pushing it, and many scientists believe that something is dark energy, making up over 2/3 of the universe and slowly tearing it apart.
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Our knowledge of the behavior of matter and the precision of our instruments means that simply observing distant stars can tell us more about the universe than we ever thought possible.
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But there are other mysteries, like the nature of dark energy upon which we have yet to shed light.
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关于本课
在这一课中，您将通过探讨光线如何揭示宇宙奥秘来提升您的英语听说能力。您将学习有关宇宙起源、扩展及其与光的关系的专业词汇和短语。这不仅将帮助您增强对复杂主题的理解，还将提高您在雅思口语练习中的表现，使您在使用英语时更加自信。此外，通过使用看YouTube学英语的方式，您将有机会进行英语口语练习，帮助您在语言表达上达到更高的水平。
关键词汇与短语
- 宇宙 (Universe)
- 光 (Light)
- 光谱 (Spectrum)
- 红移 (Redshift)
- 多普勒效应 (Doppler Effect)
- 大爆炸 (Big Bang)
- 暗能量 (Dark Energy)
- 组成 (Composition)
练习技巧
在观看这段视频时，建议您运用shadow speaks的方法进行跟读练习。在视频的每个段落之间，暂停以跟随讲者的语音速度和语调。这可以帮助您更好地掌握发音及语调变化。尤其注意与光、宇宙等复杂概念相关的术语，尝试将这些新词汇融入您的对话中。对于英语口语练习，您可以选择将视频中的内容进行简要总结，练习用英语表达您的看法和理解。这种练习方式能够提高您的口语流利度和自信心，使您在雅思口语练习中更加出色。同时，让自己沉浸于自然的语言环境中，利用看YouTube学英语的方式加深对英语的理解和灵活使用。
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。