シャドーイング練習: Why Don't Snakes Poison Themselves? - YouTubeで英語スピーキングを学ぶ
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The Egyptian cobra's venom is super toxic.
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The Egyptian cobra's venom is super toxic.
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Even in tiny quantities, it can kill relatively big animals.
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But the Egyptian cobra, as well as pretty much every other toxic animal,
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has to produce and store those deadly chemicals inside its own body.
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So why don't toxic animals hurt themselves?
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Hi, I'm Cameron, and this is MinuteEarth.
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The first, and probably most obvious,
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way to avoid kicking your own bucket is to make sure your poison doesn't work on you,
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which is a strategy many poison dart frogs use use.
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When their poison gets on another critter,
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it snaps into specially shaped receptors in that animal's nerves,
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eventually stopping its heart.
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But the poison doesn't affect the frog itself,
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because the frog has evolved a slightly different version of that nerve protein,
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changing its shape just enough to prevent the poison from ever latching on.
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Another option is to have a way to soak up your own poison before it can kill you,
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like the pitohui, a tropical bird that puts poison in its feathers.
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In order to keep itself safe from its own poison,
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it produces proteins in its bloodstream that act like sponges that stick to,
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and basically disarm, poison molecules.
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The next strategy is even simpler.
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Simply store your toxins in a place where they can't hurt you,
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like murder hornets and black widow spiders do.
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Both of these animals are susceptible to their own venom,
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but their weaponry is located in a place where it is walled off from the rest of the body,
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and for them, it's physically impossible to unleash it on themselves.
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And finally, you could store your toxins in an inactive form,
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like the slow loris, the world's only venomous primate, does.
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The toxin the loris secretes from its armpits is completely harmless on its own.
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It's only when the animal licks its armpit,
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putting the venom in contact with saliva,
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that the venom becomes activated.
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And when the loris subsequently bites an enemy,
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that venom gets transferred to the bite wound,
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where it causes the victim's flesh to rot away.
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Because carrying deadly chemical weapons inside your own body is such a high-stakes situation,
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lots of toxic species actually use more than one of these strategies to stay safe.
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Which brings us back to the Egyptian Cobra,
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which uses all four methods to protect itself from its own venom.
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The snake has those modified nerve proteins that make it immune to the nerve paralyzing toxin in its venom.
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But since that venom is a cocktail that contains other toxins to,
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the snake also stores it in walled-off glands.
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Beyond just locking the venom away,
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these glands also temporarily inactivate the venom in part by bathing it in acids.
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It only becomes reactivated in a basic environment, like its victim's blood.
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And if the venom happens to leak into the snake's own blood,
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a sponge-like protein in its bloodstream mops up the toxins before they do any harm.
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In other words, if you're going to be venomous or poisonous, Use protection.
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Thanks, Boo.dev!
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Thank you.
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このレッスンについて
このレッスンでは、ヘビがどのように自分自身を害することなく毒を使うことができるのか、その仕組みについて学びます。具体的には、エジプトコブラや他の毒を持つ動物の防御メカニズムに焦点を当て、関連する語彙やフレーズを使って英語のスピーキングスキルを向上させることが目的です。このレッスンを通して、IELTS スピーキング対策にも役立つ、自信を持ったスピーキング能力を育成しましょう。
重要な語彙とフレーズ
- 毒 (venom)
- 免疫 (immune)
- 保存する (store)
- 影響を与える (affect)
- 活性化する (activate)
- 防御メカニズム (defense mechanism)
- 脳神経 (nerve)
- 祭壇 (glands)
練習のヒント
このビデオのスピードとトーンに対応したシャドウイングを行う際には、まずはゆっくりとしたペースで字幕を見ながら、発音やイントネーションに注意を払いましょう。特に、エジプトコブラの防御メカニズムについて語る部分では、言葉のリズムに耳を傾けることで、自然な話し方を身につけることができます。また、shadow speech技法を使用して、各フレーズがどのように発音されているかを模倣することが重要です。最初は短いセクションから始め、徐々に繰り返す回数を増やすことで、自分の言語能力を向上させることができます。
このように、様々な方法を使って自分の毒から身を守る動物に関する知識を深めることで、英会話の練習にも新たな視点が加わります。IELTSのスピーキングセクションに備えるためにも、特にこのシャドウイングの練習は効果的です。さらに、効果的な練習には、shadowing siteを利用するのもおすすめです。あなたの英語の発音や流暢さを向上させましょう。
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。