シャドーイング練習: Power – Rate of Work - 動画で英語スピーキングを学ぶ

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43 文
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1
Ever walked up a flight of stairs and wondered why running up feels so much harder?
2
Think about what it takes to get up stairs.
3
With every step, your muscles lift your body against gravity.
4
If you ran up instead, you'd still have to lift your weight through the same height.
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That's where power comes in.
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Power tells us how quickly work is done.
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To find average power, divide the work by the time it takes.
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Work is measured in years, time in seconds, and power in watts.
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So, if you see a power rating of one watt, that means one gear of energy is transferred every second.
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Let's put some numbers to that.
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Imagine a climb that takes 1 ,200 years of work against gravity.
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If you take 12 seconds, your average power is 100 watts.
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What if you do that same climb in 6 seconds?
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Now you're doing 200 years of work each second.
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Half the time, twice the power.
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Imagine taking a ride in a sports car.
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The driver presses the accelerator and you feel yourself pressed back into the seat as the car picks up seats.
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The car is gaining kinetic energy.
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How quickly can its engine supply energy?
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Take a 400 kilowatt engine.
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At full power, it can deliver 400 ,000 joules of mechanical energy every second.
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Now picture a standard halfback on an everyday drive.
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It can reach motorway speed, too.
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Suppose this engine is rated at 60 kW.
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At full power, that's 60 ,000 wheels every second.
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If the two cars have similar mass, they need roughly the same gain in kinetic energy to go from rest to motorway speed.
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With similar grip and losses, the more powerful car can get there seen.
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Now let's look at the world's fastest landowner, the Cheetah.
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Imagine how quickly it has to gather speed when it chases its head.
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In just a quick drive, its muscles give its body a big increase in kinetic energy.
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That's a burst of high power.
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Compare that with a hard -working husky.
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Picture it pulling a light sled along a snowy trail.
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Once the sled is gliding at a steady speed, is the husky still doing work?
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It is.
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The snow resists the sled's motion, so the husky has to keep pulling.
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Its talent is disdaining that effort over a long distance.
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Next time you head upstairs, Think about two questions.
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How much work does it take to lift you to the top?
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And how quickly do you do it?
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The first tells you about the energy changes.
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Put that together with the time taken and you have your average path.
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Thank you.

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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「Power – Rate of Work」を教材にしています。 繰り返し出てくる語は次のとおりです：energy, speed, quickly, husky, kinetic。 この動画には、シャドーイング用の文が43文、単語が431語あります。 音声の長さは3:26です。 話す速さは1分あたり約126語で安定しており、シャドーイングしやすいペースです。 単語の83%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語発音意味
watt 名詞/wɑt/ワット
muscle 名詞/ˈmʌs.əl/筋肉, 筋
climb 動詞/ˈklaɪ̯m/登る
rat 名詞/ɹæt/鼠, ネズミ
stairs 名詞/ˈstɛɹz/階段
compare 動詞/kəmˈpɛɚ/比べる, 比較する
trail 名詞/tɹeɪl/跡, 痕跡
chase 動詞/t͡ʃeɪs/追いかける, 追跡する
steady 形容詞/ˈstɪdi/着実, 安定した
resist 動詞/ɹɪˈzɪst/抗う, 抵抗する
burst 動詞/bɜːst/破裂する
divide 動詞/dɪˈvaɪd/分割する, 分ける
grip 名詞/ˈɡɹɪp/つかむこと
upstairs 副詞/ˌʌpˈstɛɹz/階上
husky 形容詞/ˈhʌs.ki/しゃがれた

動画に出てくる句動詞

単語意味
get up 動詞起きる
pick up 動詞拾う, 拾い上げる

注意したい発音

  • 長い単語（アクセントの位置に注意）: mechanical /məˈkænəkəl/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: trail /tɹeɪl/, roughly /ˈɹʌf.li/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: gravity /ˈɡɹævɪti/, everyday /ˈɛvɹiˌdeɪ/, divide /dɪˈvaɪd/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: roughly /ˈɹʌf.li/, halfback /ˈhæfˌbæk/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。watt, muscle, climbなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →