シャドーイング練習: How Radioactive Are Your Teeth? - 動画で英語スピーキングを学ぶ

レッスンを作成中...
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How radioactive are your teeth?
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In the 1950s, American dentists collecting baby teeth found that they were dangerously radioactive and levels were rising every year.
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This is bad news.
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Radioactive teeth means radioactive bones.
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Where was all this radioactivity coming from?
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Not from their neighborhood, but nuclear weapons testing thousands of miles away.
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As tensions escalated in the Cold War, The United States and the Soviet Union designed increasingly powerful nuclear weapons, many of which were detonated on their own soil.
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Nuclear fission produces dozens of nuclei, most of which are radioactive themselves.
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Atmospheric tests at the Nevada test site carried radioactive debris east where it would fall out of the air onto pasture.
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Cows would eat this grass, making their milk slightly radioactive.
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When this milk is given to children, radioactive elements are built into bones and teeth, accumulate in the thyroid and are incorporated into every cell.
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When a radioactive nucleus decays in the body, it spits out high-energy particles, which break chemical bonds in cells,
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mutate DNA, and ultimately cause cancers like leukemia.
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And there were lots of tests.
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Altogether, over 2,000 nuclear weapons have been detonated, more than 500 of them above ground,
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spreading the radioactive fallout of 545 megatons of explosions.
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And there's no cleaning it up.
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This fallout is everywhere in the environment, causing cancers and potentially killing as many or more than the attacks on Hiroshima and Nagasaki.
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Ultimately, the discovery of radioactive teeth convinced the US and Soviet Union to sign the partial test ban treaty,
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so the good news is that above-ground testing mostly stopped during the Cold War, and the dangerous radioactive nuclei are slowly decaying away.
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But many of these nuclei have half-lives of decades to centuries, so even people born today, long after testing has stopped,
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may be killed by the fallout from last century's tests.
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While testing has mostly stopped, it could return unless the nuclear weapons states formally adopt a UN treaty to ban it.
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You have a choice.
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You can demand that the governments of the world ban nuclear testing and even nuclear weapons, or you can look in the mirror and ask yourself...
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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C1レベルのスピーキングレッスンは、動画「How Radioactive Are Your Teeth?」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：radioactive, nuclear, teeth, testing, weapons。 この動画には、シャドーイング用の文が25文、単語が359語あります。 音声の長さは2:15です。 話す速さは1分あたり約160語で、日常会話に近い自然なペースです。 英語の頻出3,000語に含まれる単語は79%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語発音意味
radioactive 形容詞/ˌɹeɪdioʊˈæktɪv/放射性
nucleus 名詞/ˈnuː.kli.əs/核, 核心
fallout 名詞/ˈfɔlˌaʊt/降下, 落下
detonate 動詞/ˈdɛtəneɪt/爆発させる
decay 名詞/diˈkeɪ/腐敗
accumulate 動詞/əˈkjuːmjʊˌleɪt/積む
dangerously 副詞危うく, 危険に
escalate 動詞/ˈɛs.kə.leɪt/エスカレートする
fission 名詞/ˈfɪʃən/分裂
leukemia 名詞/luːˈkiːmi.ə/白血病
megaton 名詞/ˈmɛɡəˌtʌn/メガトン
pasture 名詞/ˈpæst͡ʃəɹ/牧草地, 牧草
radioactivity 名詞/ˌreɪdɪəʊakˈtɪvɪti/放射能
spit 動詞/spɪt/つばを吐く, 吐く
dentist 名詞/ˈdɛntɪst/歯医者, 歯科医

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
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were detonated · is given · have been detonated
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have been detonated · has stopped

注意したい発音

  • 「th」の音: thyroid /ˈθaɪ.ɹɔɪd/, altogether /ɔl.tuˈɡɛð.ɚ/
  • 長い単語（アクセントの位置に注意）: radioactive /ˌɹeɪdioʊˈæktɪv/, accumulate /əˈkjuːmjʊˌleɪt/, leukemia /luːˈkiːmi.ə/, radioactivity /ˌreɪdɪəʊakˈtɪvɪti/, atmospheric /ˌætməsˈfɛɹɪk/

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. 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。
  3. 自分の声を録音して元の音声と比べます。radioactive, nucleus, fallout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 →