跟讀練習: Can You Define Energy? - 通過影片學習英語口語

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54 句

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Here's a question that sounds easy.

What is energy?

Go on, try it.

Define it to a friend.

You've said the word a thousand times.

You've got energy after breakfast.

A battery runs out of energy.

The sun gives off energy.

But if I asked you to point at energy, actually point at it, where would you point?

You can't.

And that's the strange part.

Energy might be the most important idea in all of science, and nobody has ever seen it.

Not once.

Not with a microscope.

Not with a telescope.

Because energy isn't a thing.

It's not stuff like water or air.

You can't fill a jar with it.

You can't put it on a scale and weigh it.

Open a textbook and you'll find energy defined as the ability to do work or to make change.

It doesn't tell you what energy is, it tells you what energy does.

And that's the catch.

We can't see energy, but we can see the changes it causes when it's converted from one form into another.

Think about a campfire.

There's a lot of air.

Chemical potential energy is stored inside the wood, but a log just looks like a log.

Then it burns, and that chemical energy converts into heat and light.

You feel the warmth on your face.

You see the glow.

You're not seeing energy.

You're seeing a conversion.

A diver standing on a diving board may not appear to have energy energy, but their height gives them gravitational potential energy.

The board stores elastic potential energy as it bends, then launches them upwards.

As they fall, gravitational potential energy becomes kinetic energy.

Energy transfers to the water, creating waves and sound.

Every step of the way, you only notice the energy at the moment it changes form.

Or look at a solar panel on a roof.

Sunlight hits it, but nothing seems to happen.

No noise, no moving parts.

It just sits there.

But inside the panel's photovoltaic cells, light energy is being converted into electrical energy.

Now step inside the home and switch on a fan.

Suddenly, the blades are spinning.

That's electrical energy converting into kinetic energy.

Light energy into electrical energy and then inside the house into many other forms.

Kinetic energy in a fan, heat in a toaster, light and sound from a TV.

So here's the sneaky bit.

Scientists don't define energy by what it is, they define it by what it does.

Textbooks say energy is the ability to make things happen, to move something, heat something, or light something up.

That's true.

But notice it describes the effects, not the thing itself.

So that's why energy is so hard to define.

We've never seen it, not once.

We've only ever seen its footprints.

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本課的詞彙與口語要點

這段影片共有 54 個句子、464 個單詞可供跟讀。講話部分時長為 3:20。說話人語速平穩，每分鐘約 139 個詞，很適合跟讀。 84% 的單詞屬於英語最常用的 3,000 詞，其餘的詞建議在練習前先學一下。

影片中的重點詞彙

影片中 15 個值得學習的單詞，附發音和釋義：

單詞	發音	釋義
define 動詞	/dɪˈfaɪn/	界定
textbook 名詞	/ˈtɛkst.bʊk/	課本 /課本, 教科書 /教科書
spin 動詞	/spɪn/	轉動 /轉動, 自轉 /自轉
scientist 名詞	/ˈsaɪəntəst/	科學家 /科學家
blade 名詞	/bleɪd/	刃, 刀身
bend 動詞	/bɛnd/	彎 /彎
dive 動詞	/daɪv/	潛水 /潛水
weigh 動詞	/weɪ/	稱重 /稱重
glow 動詞	/ɡloʊ/	發光 /發光, 發亮 /發亮
sunlight 名詞	/ˈsʌnˌlaɪt/	陽光 /陽光, 日光
telescope 名詞	/ˈtɛl.əˌskoʊp/	望遠鏡 /望遠鏡
elastic 形容詞	/ə-/	彈性的 /彈性的, 有彈力的 /有彈力的
footprint 名詞	/ˈfʊtpɹɪnt/	腳印 /腳印, 足印
microscope 名詞	/ˈmaɪ.kɹəˌskoʊp/	顯微鏡 /顯微鏡
kinetic 形容詞	/kɪˈnɛtɪk/	運動的 /運動的, 動的 /動的

影片中出現的短語動詞

單詞	發音	釋義
give off 動詞	/ɡɪv ɒf/	散發 /散發, 發出 /發出

影片中的語法

說話人最常用的結構，並附上影片中的原話：

結構	影片中的用法
現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事	You've said · has ever seen · We've never seen
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	is stored · being converted

需要注意的發音

說話人用了 14 次縮略和弱讀形式，例如 can't, we've, you're。請按聽到的簡短形式來說。

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

如何用這段影片練習

先完整聽一遍影片，不要開口，記下不認識的單詞。
用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
錄下自己的聲音並與原聲對比，特別注意 define, textbook, spin 這類單詞。

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。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: Can You Define Energy? - 通過影片學習英語口語

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