シャドーイング練習: Bare Hand Bottle Busting- Science Investigation - 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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- Today I am here with Kevin, more commonly known as the Backyard Scientist.
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And as fate would have it, we are actually in- - The backyard.
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- So I recently made a video where I converted a leaf blower into a snowball machine gun and the first thing he said was- - You should set those on fire.
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- So as soon as I got here today, we- But flaming snowballs aren't actually why I'm here today.
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Show 'em why I'm here today, Kevin.
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So I actually don't drink, but I've heard of people doing this with beer bottles.
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So either Kevin has some superpowers, or there's some crazy physics going on there that we're gonna try and figure out today.
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- So neither of us really knows what causes these bottles to break and there's a lot of conflicting evidence out there but we have some of our own ideas.
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- So as firm believers in the scientific method, we are going to science our way to the right answer through a bunch of experiments.
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- I'll drink to that.
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- Not yet you won't, Kevin. - I've heard that one of the reasons people think it's breaking is because when they slam their hand down on it, they're forcing a bunch of air in the bottle and that causes the bottom to shoot out.
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- So in this experiment, we're testing the pressure wave theory, where when a person hits it with their hand, they force a bunch of air in that then creates a pressure wave that pushes out the bottom of the bottle.
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So we've put a cap on the top, so there's no way to force air in.
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We're using a rubber mallet just to be more consistent for all of the hits.
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One. The bottle broke, even though the cap was on, and there was no way to force air in, so we are rejecting this theory.
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- We think carbonation might have something to do with it.
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- Okay so to isolate that, we have one beer that's carbonated, one with water, and then we filled this one with sparkling water.
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So if these two don't break and this one breaks, I think we've isolated that it works better without carbonation.
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- Yes. - So this bottle is filled with sparkling water, so the theory is that it shouldn't break.
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And now for the beer, the bottle didn't break, but that was interesting how much it fizzed up.
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So as it turns out, here's why that happens.
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When you hit the bottle, it moves down really fast, but the liquid hasn't started moving yet.
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That creates an empty gap down here, that's basically a vacuum or really low pressure.
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And if the drink is carbonated, the CO2 from the liquid gets sucked into that vacuum and fills it with CO2 gas bubbles.
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And since these bubbles are less dense than the drink, they rise up through the liquid and create a chain reaction of more bubbles as they go.
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Now finally, we test the water, and just like with the carbonated liquids, you see this vacuum form on the bottom.
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Except this time the bottle breaks.
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So theory number two is confirmed, non-carbonated liquids work better.
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But now we just have to figure out why.
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What are they doing differently to make the bottle actually break?
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- So what I think is breaking the bottle is the momentum of the water going back and filling the vacuum is causing the bottom to break out.
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- And I think the break is happening a little bit earlier.
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When the vacuum is formed like the air outside is at 14 PSI and so it's pushing in on the vacuum.
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So it's before the water rebounds, it's actually cracking because the difference in pressure.
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- Well we'll find out.
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- Round three. Fight!
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- So we're gonna add some red dye and then we're gonna slow the camera down to like 7,000 frames per second to see precisely the moment when it happens.
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One. So if I'm right, okay, bottle, it should break right there.
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- No. - Yes! - You punk.
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Yeah so you're definitely right.
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- Yeah. - It ruptured when the water is coming back right?
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- Cracks right after it hits the bottom.
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- So Kevin was right. In fact, it turns out that water cavity collapses 10 times faster than it formed, which creates a force higher than the initial hit on the bottle, which is why it doesn't break right away.
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So now that you know the science, if you want to impress your friends with this trick, here are a couple important tips.
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Number one, hit the bottle and not your hand.
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You want to make as much energy from your strike go into moving the bottle and not just being reacted by your hand.
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You can even get the neck of the bottle a little wet and then let it slip a bit when you hit it, just to make sure it's moving.
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Number two, like we discovered, use water or something non-carbonated.
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Otherwise, the carbonation just fills in that vacuum and cushions the rebound force.
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Number three, a liquid with a high vapor pressure is good.
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If you use a liquid with a high vapor pressure that means the vacuum you need at the bottom of the bottle will form much easier, so hot water is a lot better than cold water because the vapor pressure's higher.
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Nail polish remover also works well for the same reason.
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Number four, be safe, this is glass, and glass can cut you if you're not careful where it lands.
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Number five, don't chicken out.
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It hurts way more if you don't follow through.
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Plus you look like this.
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- Oh, I heard it. Did it hurt?
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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B2レベルのスピーキングレッスンは、動画「Bare Hand Bottle Busting- Science Investigation」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：bottle, break, vacuum, liquid, bottom。 この動画には、シャドーイング用の文が57文、単語が948語あります。 音声の長さは5:25です。 話す速さは1分あたり約175語で、日常会話に近い自然なペースです。 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 |
|---|---|---|
| vacuum 名詞 | /ˈvæ.kjuːm/ | 真空 |
| vapor 名詞 | /ˈveɪpɚ/ | 気体, 蒸気 |
| bubble 名詞 | /ˈbʌbəl/ | 泡 |
| snowball 名詞 | /ˈsnoʊbɔl/ | 雪玉, 雪つぶて |
| isolate 動詞 | /ˈaɪ.sə.leɪt/ | 切り離す, 隔絶する |
| backyard 名詞 | /bækˈjɑːd/ | 裏庭 |
| blower 名詞 | /ˈbloʊ.ɚ/ | ブロワー |
| mallet 名詞 | /ˈmælɪt/ | 木槌 |
| rupture 名詞 | /ˈɹʌpt͡ʃɚ/ | 破裂 |
| superpower 名詞 | 超大国, スーパーパワー | |
| cushion 名詞 | /ˈkʊʃən/ | 座布団, クッション |
| cavity 名詞 | /ˈkæv.ɪt.i/ | 腔 |
| believer 名詞 | /bɪˈlivɚ/ | 信徒, 信者 |
| dense 形容詞 | /ˈdɛns/ | 濃い, 密 |
| slam 動詞 | /ˈslæm/ | ばたんと閉める |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| break out 動詞 | 脱出する |
| come back 動詞 | 戻る, 帰る |
| find out 動詞 | 見出す, 調べる |
| go back 動詞 | 戻る, 帰る |
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 |
|---|---|
| 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 | I've heard · we've put · we've isolated |
| 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 | is filled · is carbonated · is confirmed |
注意したい発音
話し手はwe're, don't, gonnaなど、短縮形や弱形を30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。
- 長い単語（アクセントの位置に注意）: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
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: sparkling /ˈspɑɹkl̩ɪŋ/, precisely /pɹɪˈsaɪs.li/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: vacuum /ˈvæ.kjuːm/, vapor /ˈveɪpɚ/, cavity /ˈkæv.ɪt.i/, believer /bɪˈlivɚ/, convert /kənˈvɝt/
- 子音の連続 — 間に母音を入れない: snowball /ˈsnoʊbɔl/, rebound /ˈɹi.baʊnd/, sparkling /ˈspɑɹkl̩ɪŋ/, blower /ˈbloʊ.ɚ/, impress /ɪmˈpɹɛs/
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。vacuum, vapor, bubble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。