跟读练习: Can You Define Energy? - 通过视频学习英语口语

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Here's a question that sounds easy.
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What is energy?
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Go on, try it.
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Define it to a friend.
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You've said the word a thousand times.
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You've got energy after breakfast.
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A battery runs out of energy.
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The sun gives off energy.
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But if I asked you to point at energy, actually point at it, where would you point?
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You can't.
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And that's the strange part.
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Energy might be the most important idea in all of science, and nobody has ever seen it.
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Not once.
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Not with a microscope.
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Not with a telescope.
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Because energy isn't a thing.
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It's not stuff like water or air.
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You can't fill a jar with it.
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You can't put it on a scale and weigh it.
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Open a textbook and you'll find energy defined as the ability to do work or to make change.
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It doesn't tell you what energy is, it tells you what energy does.
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And that's the catch.
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We can't see energy, but we can see the changes it causes when it's converted from one form into another.
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Think about a campfire.
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There's a lot of air.
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Chemical potential energy is stored inside the wood, but a log just looks like a log.
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Then it burns, and that chemical energy converts into heat and light.
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You feel the warmth on your face.
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You see the glow.
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You're not seeing energy.
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You're seeing a conversion.
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A diver standing on a diving board may not appear to have energy energy, but their height gives them gravitational potential energy.
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The board stores elastic potential energy as it bends, then launches them upwards.
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As they fall, gravitational potential energy becomes kinetic energy.
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Energy transfers to the water, creating waves and sound.
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Every step of the way, you only notice the energy at the moment it changes form.
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Or look at a solar panel on a roof.
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Sunlight hits it, but nothing seems to happen.
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No noise, no moving parts.
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It just sits there.
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But inside the panel's photovoltaic cells, light energy is being converted into electrical energy.
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Now step inside the home and switch on a fan.
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Suddenly, the blades are spinning.
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That's electrical energy converting into kinetic energy.
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Light energy into electrical energy and then inside the house into many other forms.
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Kinetic energy in a fan, heat in a toaster, light and sound from a TV.
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So here's the sneaky bit.
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Scientists don't define energy by what it is, they define it by what it does.
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Textbooks say energy is the ability to make things happen, to move something, heat something, or light something up.
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That's true.
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But notice it describes the effects, not the thing itself.
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So that's why energy is so hard to define.
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We've never seen it, not once.
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We've only ever seen its footprints.
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本课的词汇与口语要点

这段视频共有 54 个句子、464 个单词可供跟读。 讲话部分时长为 3:20。 说话人语速平稳，每分钟约 139 个词，很适合跟读。 84% 的单词属于英语最常用的 3,000 词，其余的词建议在练习前先学一下。

视频中的重点词汇

视频中 15 个值得学习的单词，附发音和释义：

单词发音释义
define 动词/dɪˈfaɪn/界定
textbook 名词/ˈtɛkst.bʊk/課本 /课本, 教科書 /教科书
spin 动词/spɪn/轉動 /转动, 自轉 /自转
scientist 名词/ˈsaɪəntəst/科學家 /科学家
blade 名词/bleɪd/刃, 刀身
bend 动词/bɛnd/彎 /弯
dive 动词/daɪv/潛水 /潜水
weigh 动词/weɪ/稱重 /称重
glow 动词/ɡloʊ/發光 /发光, 發亮 /发亮
sunlight 名词/ˈsʌnˌlaɪt/陽光 /阳光, 日光
telescope 名词/ˈtɛl.əˌskoʊp/望遠鏡 /望远镜
elastic 形容词/ə-/彈性的 /弹性的, 有彈力的 /有弹力的
footprint 名词/ˈfʊtpɹɪnt/腳印 /脚印, 足印
microscope 名词/ˈmaɪ.kɹəˌskoʊp/顯微鏡 /显微镜
kinetic 形容词/kɪˈnɛtɪk/運動的 /运动的, 動的 /动的

视频中出现的短语动词

单词发音释义
give off 动词/ɡɪv ɒf/散發 /散发, 發出 /发出

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构视频中的用法
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事You've said · has ever seen · We've never seen
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的is stored · being converted

需要注意的发音

说话人用了 14 次缩略和弱读形式，例如 can't, we've, you're。请按听到的简短形式来说。

  • “sh” 和 “zh” 音: conversion /kənˈvɝʒən/, gravitational /ˌɡɹævɪˈteɪʃənəl/
  • 长单词——注意重音位置: electrical /ɪˈlɛktɹɪkəl/, gravitational /ˌɡɹævɪˈteɪʃənəl/

如何用这段视频练习

  1. 先完整听一遍视频，不要开口，记下不认识的单词。
  2. 用正常速度逐句跟读，每句重复到你的节奏与说话人一致为止。
  3. 录下自己的声音并与原声对比，特别注意 define, textbook, spin 这类单词。

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。

影子跟读法: 阅读完整分步指南 →