シャドーイング練習: Four Places We Might Find Aliens - 動画で英語スピーキングを学ぶ

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We don't actually know if aliens exist, but if they do, their cells probably have a special type of membrane.

And that knowledge alone tells us where we can look for them, and maybe even what they'll be like.

Hi, I'm David, and this is MinuteEarth.

There are lots of different ways scientists can search for life on other planets.

They can listen for radio signals from alien civilizations.

They can scan distant atmospheres for the chemical fingerprints life leaves behind.

And they can send spacecraft to sample places in our own solar system where life might be hiding.

Or they can search for places that have the right conditions for a particular type of membrane to form.

This last one is actually a pretty powerful tool for zeroing in on possible extraterrestrial life,

because virtually every cell on Earth is wrapped in a membrane that keeps its contents inside,

builds up a gradient by piling charged particles on one side, and then captures energy as those particles flow back through to the other.

These membranes, we can call them electrochemical membranes, are so fundamental to life that many experts think that extraterrestrial life will likely have them too.

On Earth, electrochemical membranes are formed from a specific set of elements, carbon, hydrogen, oxygen, nitrogen, and phosphorus, which can form molecules that,

in the presence of liquid water, assemble into, well, membranes.

And those membranes in turn form the foundation of life on Earth.

So one way to find extraterrestrial life is to look for other worlds

that have those same elements and the liquid water

that would allow them to self -assemble and some sort of energy to power the life forms.

And there are two of those worlds relatively nearby.

Saturn's moon Enceladus has all of those elements and liquid water, though the ocean is buried under a thick shell of ice.

So the membranes crucial to life could potentially form on Enceladus.

But without direct sunlight, there's not much energy available.

Any life

that formed there would likely have to rely on the trickle of energy coming from hydrothermal vents on the ocean floor.

So I imagine that any life there would be small and live right next to those vents.

Jupiter's moon Europa also has all five of those membrane -building elements and a liquid ocean under an icy shell.

But unlike energy -poor Enceladus, Europa is constantly being bombarded by radiation from Jupiter,

and experiences much more tidal heating as it gets pushed and pulled by the massive planet.

So if there is life on Europa, perhaps it's faster moving because it has more access to that energy.

And then there's K2 -18b, a planet about 120 light -years away from us.

From spectroscopy, we're pretty sure that it has at least three of the required elements to build

Earth -like electrochemical membranes, and it may even have liquid water.

But it's also surrounded by a thick layer of hydrogen gas, which for complicated chemistry reasons,

some scientists speculate would lead not to the development of lots of individual membranes, but instead one big one.

So that makes me envision alien life on K2 -18b that's not multiple organisms, but instead a single giant film that covers the entire world.

And life may not actually be limited to worlds with exact

Earth -like chemistry, because scientists think that in some cases, electrochemical membranes might be able to form from slightly different ingredients.

The clouds surrounding

Venus, for example, have no liquid water.

So Earth -like membranes couldn't form there.

And even if they did, the clouds are made of concentrated sulfuric acid, which would destroy those membranes on contact.

What scientists have discovered, though, is that electrochemical membranes built with sulfur can actually self -assemble and survive in strong acid.

So any life on Venus would probably have to form inside droplets of sulfuric acid.

And because those droplets would have access to plenty of energy from sunlight as they floated up and down in the clouds,

I picture excited aliens bopping around in their little acid bubbles.

Again, we still don't know whether aliens exist.

But focusing on the likelihood that they'll have electrochemical membranes doesn't just tell us where to look.

It also hints that whatever we find could be deeply weird.

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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「Four Places We Might Find Aliens」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：membrane, energy, electrochemical, liquid, Earth。この動画には、シャドーイング用の文が48文、単語が718語あります。音声の長さは3:25です。話す速さは速く、1分あたり約210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。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
liquid 名詞	/ˈlɪk.wɪd/	液体, 流体
element 名詞	/ˈɛləmənt/	要素, エレメント
acid 名詞	/ˈæsɪd/	酸
scientist 名詞	/ˈsaɪəntəst/	科学者
membrane 名詞	/ˈmɛm.bɹeɪn/	膜
cloud 名詞	/ˈklaʊ̯d/	雲, 雲霞
assemble 動詞	/əˈsɛm.bəl/	集める, 組み立てる
thick 形容詞	/θɪk/	太い, 厚い
shell 名詞	/ʃɛl/	殻, 貝殻
chemistry 名詞	/ˈkɛm.ɪ.stɹi/	化学
hydrogen 名詞	/ˈhaɪdɹəd͡ʒ(ə)n/	水素
particle 名詞	/ˈpɑɹtək(ə)l/	粒子
sunlight 名詞	/ˈsʌnˌlaɪt/	日光, 太陽光
surround 動詞	/səˈɹaʊnd/	囲む, 取り巻く
complicated 形容詞	/ˈkɑm.plɪˌkeɪ.tɪd/	複雑な

動画に出てくる句動詞

単語	意味
leave behind 動詞	置き忘れる

注意したい発音

話し手はdon't, they'll, couldn'tなど、短縮形や弱形を8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。

「sh」と「zh」の音: shell /ʃɛl/, capture /ˈkæp.(t)ʃɚ/, potentially /pəˈtɛnʃ(ə)li/, crucial /ˈkɹuː.ʃəl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/
長い単語（アクセントの位置に注意）: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, potentially /pəˈtɛnʃ(ə)li/, fundamental /ˌfʌn.dəˈmɛn.təl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, virtually /ˈvɚ.t͡ʃə.wə.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: particle /ˈpɑɹtək(ə)l/, rely /ɹɪˈlaɪ/, crucial /ˈkɹuː.ʃəl/, extraterrestrial /ˌɛk.stɹə.təˈɹɛs.tɹi.əl/, droplet /ˈdɹɑplət/
/v/ — /b/ にならないように、上の歯を下唇に当てる: vent /vɛnt/, discover /dɪˈskʌvə/, virtually /ˈvɚ.t͡ʃə.wə.li/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, envision /ɪnˈvɪʒn̩/
/f/ — 「フ」ではなく、上の歯と下唇で出す: atmosphere /ˈætməsˌfɪɹ/, fundamental /ˌfʌn.dəˈmɛn.təl/, leaf /lif/, float /fləʊt/, spacecraft /ˈspeɪsˌkɹæft/

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。liquid, element, acid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 →

シャドーイング練習: Four Places We Might Find Aliens - 動画で英語スピーキングを学ぶ

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