シャドーイング練習: The Feynman Technique Actually Works But You're Doing It Wrong - 動画で英語スピーキングを学ぶ
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125 文
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There is a learning technique so powerful that the man who invented it won a Nobel Prize.
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It has been taught at MIT.
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It has been cited in hundreds of peer -reviewed studies on memory and retention.
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It is, by almost every measure, the single most effective way to actually learn something rather than just recognize it.
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And almost everyone who uses it is using it wrong.
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The Feynman Technique is not about writing things down.
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It is not about reading slowly.
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It is not about making better notes.
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It is about one thing.
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The moment you discover you don't actually understand something you thought you did.
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Most people skip that moment.
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They highlight the thing.
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They move on.
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And two weeks later, it's gone.
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By the end of this video, you will know exactly why that happens.
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Exactly what Richard Feynman actually did.
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And exactly how to use this technique in a way that actually sticks.
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Four steps.
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One principle underneath all of them.
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And step three is the one nobody talks about.
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And it is the reason most people never get results from this.
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Let's get into it.
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Richard Feynman was a theoretical physicist at Caltech.
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He won the Nobel Prize in Physics in 1965 for his work on quantum electrodynamics.
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But what made Feynman genuinely unusual was not his intelligence.
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It was his obsession with the difference between knowing the name of something and actually understanding it.
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He used to tell a story about his father.
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When Feynman was a child, his father would point at a bird and say, that's a brown -throated thrush,
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but in Portuguese, it's called a gamba da perera.
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In Chinese, it's called something else entirely.
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Now you know the name in every language, but you still know absolutely nothing about the bird.
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Knowing the name is not the same as knowing the thing.
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That one idea became the foundation of everything Feynman did as a scientist and as a teacher.
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And it is the foundation of the technique that bears his name.
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The first step is simple.
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Pick one concept you want to understand.
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Not a whole subject.
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Not a chapter.
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One concept.
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Cognitive dissonance.
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Supply and demand.
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Natural selection.
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The sunk cost fallacy.
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One thing.
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Feynman was specific about this because complexity is where understanding goes to hide.
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When you try to understand everything at once, you feel like you are learning.
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You are not learning.
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You are moving.
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The technique only works when you slow down enough to actually examine one thing at a time.
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Write the concept at the top of a blank page.
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That is step one.
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Now explain it, out loud or on paper.
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But here is the rule.
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Explain it as if you are teaching it to a 12 -year -old who has never heard of it.
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No jargon, no borrowed phrases from the textbook.
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No, it's basically like, followed by another technical term, plain language only.
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This is where most people fail immediately, because the moment you try to explain something without jargon,
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you discover whether you actually understand it or whether you have just memorized the words that describe it.
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Feynman called this the difference between knowing something and knowing the name of something.
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Most studying is name learning.
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You read the definition, you recognize it on a test, but you cannot explain it to someone who has never heard of it.
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And if you cannot explain it simply, you do not understand it.
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You just have familiarity with it.
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These are not the same thing.
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This is the step nobody talks about, and it is the most important one.
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When you try to explain your concept out loud, you will hit a moment where you slow down, where you use a word you cannot define,
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where you say, it's like, you know, and trail off.
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That moment is not failure.
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That moment is the entire point.
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Feynman called these the gaps, the places where your understanding breaks down and you have been covering with borrowed language.
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Most students feel embarrassed by these moments and try to skip past them.
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Feynman did the opposite.
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He wrote them down.
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He treated each gap as a research assignment.
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This specific thing I cannot explain is the next thing I need to actually learn.
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This is why the technique works, because it doesn't let you move forward until you actually understand what you're leaving behind.
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Most studying feels productive, but produces nothing, because it is all forward motion with no accountability.
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The Feynman technique stops you, makes you look at the gap, and forces you to fill it before you continue.
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This is where I want show you something I have added to my own process for exactly this step.
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So I'm reading about procrastination.
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I land on this line about the prefrontal cortex and impulse control.
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I read it, I think I get it, then I do the Feynman test, try to explain it out loud, and I realize I cannot.
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I click this chrome extension called Explain by Scrimba.
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It reads what is on my screen and generates a short explainer video about procrastination.
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The broad picture, clearly explained.
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That alone is useful, but the real move is what comes next.
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There is a go deeper button.
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I click it, type exactly what I am stuck on, and it generates a second video targeted to that specific gap.
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Not a lecture, just the thing I could not explain, explained.
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That is the Feynman loop closing in real time.
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And if you are already inside ChatGPT, or working with Claude, they have a plugin and MCP integration too,
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so you can use it wherever you already think.
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It is free to start using.
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Link is in the description.
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Once you have filled the gap, go back to your explanation.
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Rewrite it.
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This time, add an analogy, a comparison to something the person already understands.
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Feynman was famous for this.
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He explained quantum physics using analogies about rubber bands, about wet grass, about things people touched and saw every day.
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Not because he was dumbing things down.
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Because a good analogy is proof that you understand something well enough to see what it resembles.
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If you cannot think of an analogy, you do not understand it well enough yet.
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Go back to step two.
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This cycle, explain, find the gap, fill it, simplify, explain again, is the loop.
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You run it until your explanation is so clean and so simple that anyone could follow it.
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When you reach that point, you own the concept.
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Not for the test, not until the end of term.
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You own it the way Feynman owned physics, permanently.
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Here is the honest version of why this works when everything else does not.
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Most study techniques are about input.
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Read more, watch more, highlight more, take better notes.
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The Feynman technique is about output.
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It forces you to produce an explanation before you are ready, and in that production, every gap in your understanding becomes visible.
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The discomfort you feel in step two, where you are trying to explain something and realizing you cannot,
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that is not a sign that you are failing.
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That is the technique working.
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That discomfort is the exact moment most students skip over, and it is the exact moment where real learning happens.
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Feynman used to say that the first principle of understanding is that you must not fool yourself, and the easiest person to fool is yourself.
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This technique makes that impossible, because you cannot fake an explanation to a 12 year old who does not know the words you are hiding behind.
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Four steps, one principle.
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Choose the concept, explain it simply, find the gaps, fill them, and simplify again.
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Pick one thing you are studying this week and run it through this loop once, just once.
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See what you find out about what you actually know.
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If this changed how you think about learning, you know what to do.
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I will see you in the next one.
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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「The Feynman Technique Actually Works But You're Doing It Wrong」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：Feynman, explain, technique, step, moment。 この動画には、シャドーイング用の文が125文、単語が1340語あります。 音声の長さは6:53です。 話す速さは速く、1分あたり約194語です。音のつながりや弱く発音される音が多くなります。 単語の85%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 |
|---|---|---|
| technique 名詞 | /tɛkˈniːk/ | 技術 |
| explanation 名詞 | /ˌɛkspləˈneɪʃən/ | 説明 |
| analogy 名詞 | /əˈnæləd͡ʒi/ | 類推, アナロジー |
| physics 名詞 | /ˈfɪz.ɪks/ | 物理学 |
| principle 名詞 | /ˈpɹɪn.sɪ.pəl/ | 原理, 原則 |
| loop 名詞 | /luːp/ | ループ |
| skip 動詞 | /skɪp/ | はね回る |
| gap 名詞 | /ɡæp/ | 間隙, ずれ |
| discover 動詞 | /dɪˈskʌvə/ | 発見する, 見つける |
| generate 動詞 | /ˈd͡ʒɛn.ə.ɹeɪt/ | 生む, 生み出す |
| highlight 動詞 | /ˈhaɪˌlaɪt/ | ハイライト |
| quantum 名詞 | /ˈkwɑntəm/ | 量 |
| borrow 動詞 | /ˈbɑɹ.oʊ/ | 借りる |
| discomfort 名詞 | /dɪsˈkʌmfɚt/ | 不快, 不安 |
| extension 名詞 | /ɪkˈstɛnʃən/ | 拡張, 拡大 |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| slow down 動詞 | 遅らせる |
| leave behind 動詞 | 置き忘れる |
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 「used to」 used to + 動詞 — 今はもう違う過去の習慣や状態 | used to tell · used to say |
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | has been taught · has been cited · has never heard |
| 関係詞節 who / which + 節 — 人や物について情報を加える | man who invented · everyone who uses · someone who has |
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | has been taught · has been cited |
注意したい発音
話し手はdoesn't, don't, I'mなど、短縮形や弱形を4回使っています。聞こえたとおりの短い形で発音しましょう。
- 「th」の音: throat /ˈθɹoʊt/, underneath /ˌʌndɚˈniθ/, theoretical /ˌθi.əˈɹɛt.ɪ.kəl/, thrush /θɹʌʃ/
- 「sh」と「zh」の音: explanation /ˌɛkspləˈneɪʃən/, extension /ɪkˈstɛnʃən/, unusual /ʌnˈjuːʒ(u)əl/, integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, obsession /əbˈsɛʃən/
- 長い単語（アクセントの位置に注意）: explanation /ˌɛkspləˈneɪʃən/, analogy /əˈnæləd͡ʒi/, unusual /ʌnˈjuːʒ(u)əl/, integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, genuinely /ˈd͡ʒɛn.ju.ɪn.li/
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: principle /ˈpɹɪn.sɪ.pəl/, trail /tɹeɪl/, theoretical /ˌθi.əˈɹɛt.ɪ.kəl/, resemble /ɹɪˈzɛmbəl/, explainer /ɪkˈspleɪnə(ɹ)/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: discover /dɪˈskʌvə/, visible /ˈvɪzɪb(ə)l/, wherever /(h)wɛɹˈɛvɚ/, productive /pɹəˈdʌk.tɪv/, cognitive /ˈkɑɡ.nɪ.tɪv/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: physics /ˈfɪz.ɪks/, discomfort /dɪsˈkʌmfɚt/, define /dɪˈfaɪn/, phrase /ˈfɹeɪ̯z/, simplify /ˈsɪmplɪfaɪ/
この動画での練習方法
- 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。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。technique, explanation, analogy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。