跟读练习: Power – Rate of Work - 通过视频学习英语口语

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Ever walked up a flight of stairs and wondered why running up feels so much harder?

Think about what it takes to get up stairs.

With every step, your muscles lift your body against gravity.

If you ran up instead, you'd still have to lift your weight through the same height.

That's where power comes in.

Power tells us how quickly work is done.

To find average power, divide the work by the time it takes.

Work is measured in years, time in seconds, and power in watts.

So, if you see a power rating of one watt, that means one gear of energy is transferred every second.

Let's put some numbers to that.

Imagine a climb that takes 1 ,200 years of work against gravity.

If you take 12 seconds, your average power is 100 watts.

What if you do that same climb in 6 seconds?

Now you're doing 200 years of work each second.

Half the time, twice the power.

Imagine taking a ride in a sports car.

The driver presses the accelerator and you feel yourself pressed back into the seat as the car picks up seats.

The car is gaining kinetic energy.

How quickly can its engine supply energy?

Take a 400 kilowatt engine.

At full power, it can deliver 400 ,000 joules of mechanical energy every second.

Now picture a standard halfback on an everyday drive.

It can reach motorway speed, too.

Suppose this engine is rated at 60 kW.

At full power, that's 60 ,000 wheels every second.

If the two cars have similar mass, they need roughly the same gain in kinetic energy to go from rest to motorway speed.

With similar grip and losses, the more powerful car can get there seen.

Now let's look at the world's fastest landowner, the Cheetah.

Imagine how quickly it has to gather speed when it chases its head.

In just a quick drive, its muscles give its body a big increase in kinetic energy.

That's a burst of high power.

Compare that with a hard -working husky.

Picture it pulling a light sled along a snowy trail.

Once the sled is gliding at a steady speed, is the husky still doing work?

It is.

The snow resists the sled's motion, so the husky has to keep pulling.

Its talent is disdaining that effort over a long distance.

Next time you head upstairs, Think about two questions.

How much work does it take to lift you to the top?

And how quickly do you do it?

The first tells you about the energy changes.

Put that together with the time taken and you have your average path.

Thank you.

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本课的词汇与口语要点

这节口语课以视频“Power – Rate of Work”为素材。视频中反复出现的词有：energy, speed, quickly, husky, kinetic。这段视频共有 43 个句子、431 个单词可供跟读。讲话部分时长为 3:26。说话人语速平稳，每分钟约 126 个词，很适合跟读。 83% 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
watt 名词	/wɑt/	瓦特
muscle 名词	/ˈmʌs.əl/	肌肉, 筋肉
climb 动词	/ˈklaɪ̯m/	登
rat 名词	/ɹæt/	лочў, 鳥鼠 /鸟鼠
stairs 名词	/ˈstɛɹz/	樓梯 /楼梯
everyday 形容词	/ˈɛvɹiˌdeɪ/	日常的
compare 动词	/kəmˈpɛɚ/	比, 比較 /比较
trail 名词	/tɹeɪl/	足跡 /足迹, 蹤跡 /踪迹
chase 动词	/t͡ʃeɪs/	追逐, 追
steady 形容词	/ˈstɪdi/	穩定 /稳定
resist 动词	/ɹɪˈzɪst/	抵制, 抵抗
burst 动词	/bɜːst/	爆裂, 破裂
divide 动词	/dɪˈvaɪd/	分, 分裂
grip 名词	/ˈɡɹɪp/	柄
upstairs 副词	/ˌʌpˈstɛɹz/	樓上 /楼上

视频中出现的短语动词

单词	释义
get up 动词	起床
pick up 动词	拾取, 撿 /捡

需要注意的发音

长单词——注意重音位置: mechanical /məˈkænəkəl/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: gravity /ˈɡɹævɪti/, everyday /ˈɛvɹiˌdeɪ/, divide /dɪˈvaɪd/
词尾辅音 — 要读清楚，后面不要加元音: watt /wɑt/, rat /ɹæt/, stairs /ˈstɛɹz/, chase /t͡ʃeɪs/, resist /ɹɪˈzɪst/
/r/ 和 /l/ 的区别: trail /tɹeɪl/, roughly /ˈɹʌf.li/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

如何用这段视频练习

先完整听一遍视频，不要开口，记下不认识的单词。
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。
录下自己的声音并与原声对比，特别注意 watt, muscle, climb 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。

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跟读练习: Power – Rate of Work - 通过视频学习英语口语

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