シャドーイング練習: What is the universe made of? - Dennis Wildfogel - YouTubeで英語スピーキングを学ぶ

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All the material objects around you are composed of submicroscopic units we call molecules.
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All the material objects around you are composed of submicroscopic units we call molecules.
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And molecules in turn are composed of individual atoms.
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Molecules frequently break apart and then form new molecules.
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On the other hand, virtually all the atoms you come in to contact with through the course of your life, the ones in the ground beneath you, the air you breath, the food you eat, those that make up every living thing, including you, have existed for billions of years and were created in places very unlike our planet.
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How those atoms came about is what I want to share with you.
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It all started 14 billion years ago with an event we call The Big Bang, which resulted in a universe consisting of gas alone.
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There were no stars and no planets.
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The gas was made up only of atoms belonging to the simplest elements.
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It was about 75 percent hydrogen and almost all the rest was helium.
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No elements like carbon, oxygen or nitrogen existed.
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No iron, silver or gold.
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In some places, the density of this gas was slightly higher than in others.
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Due to gravity, those places attracted even more gas, which further strengthened the pull of gravity, which then drew more gas in, and so on.
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Eventually, large dense gas balls formed, shrinking under their own gravity and consequently heating up on the inside.
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At some point, the core of such a ball gets hot enough that nuclear fusion occurs.
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Hydrogen atoms smash together to form helium, accompanied by a great release of energy, strong enough to counteract the shrinking force of the gravity.
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When the energy pushing out from the fusion reactions matches the gravity pulling all the gas inwards, an equilibrium occurs.
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From this a star is born.
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Over its lifetime, the fusion reactions in the core of a massive star will produce not only helium, but also carbon, oxygen, nitrogen and all the other elements in the periodic table up to iron.
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But eventually, the core's fuel runs out, leaving it to collapse completely.
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That causes an unbelievably powerful explosion we call a supernova.
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Now there are two things to note about how supernovas create elements.
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First, this explosion releases so much energy that fusion goes wild forming elements with atoms even heavier than iron like silver, gold and uranium.
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Second, all the elements that had been accumulating in the core of the star, like carbon, oxygen, nitrogen, iron, as well as all of those formed in the supernova explosion, are ejected in to interstellar space where they mix with the gas that's already there.
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History then repeats itself.
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Gas clouds, now containing many elements besides the original hydrogen and helium, have higher density areas that attract more matter, and so on.
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As before, new stars result.
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Our sun was born this way about 5 billion years ago.
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That means that the gas it arose from had itself been enriched with many elements from supernova explosions since the universe began.
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So that's how the sun wound up with all the elements.
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It's still mostly hydrogen at 71 percent, with most of the rest being helium at 27 percent.
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But bear in mind that while the first stars were made up of hydrogen and helium alone, the remaining elements in the periodic table make up two percent of the sun.
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And what about Earth?
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Planets form as an incidental process to star formation out of the same gas cloud as the star itself.
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Small planets like ours don't have enough gravity to hold on to much hydrogen or helium gas since both of those are very light.
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So, even though carbon, nitrogen, oxygen and so on made up only two percent of the gas cloud from which Earth was formed, these heavier elements form the bulk of our planet and everything on it.
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Think about this: with the exception of hydrogen and some helium, the ground you walk on, the air you breath, you, everything is made of atoms that were created inside stars.
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When scientists first worked this out over the first half of the 20th Century, the famous astronomer Harlow Shapley commented, "We are brothers of the boulders, cousins of the clouds."
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このレッスンについて

このレッスンでは、宇宙の構成要素に関する英語の内容を通じて、英語スピーキングのスキルを向上させることを目的としています。このビデオでは、宇宙がどのように形成されたか、星や元素の生成について学ぶことができます。特に、英語のシャドーイング技法を用いて、教材からの具体的なフレーズや語彙を実践し、発音を改善しましょう。

重要な語彙とフレーズ

  • molecules（分子）
  • atoms（原子）
  • nuclear fusion（核融合）
  • supernova（超新星）
  • elements（元素）
  • gravity（重力）
  • interstellar space（星間空間）
  • density（密度）

練習のコツ

このビデオのスピードは中程度ですが、用語が専門的であるため、英語シャドーイングを行う際は、以下のアドバイスを参考にしてください。

  • 繰り返し練習する：難しいフレーズや単語は繰り返して練習し、理解を深めましょう。特に、nuclear fusionやsupernovaなど、専門用語に重点を置いて練習してください。
  • 音声をしっかり聞く：発音のニュアンスを掴むために、ビデオを何度も視聴し、シャドーイングを行いましょう。また、まねをすることで英語の発音を良くする手助けにもなります。
  • ペースを調整する：最初はゆっくりしたペースでシャドーイングを行い、慣れてきたら徐々に速度を上げてみてください。これはIELTS スピーキング対策にも役立ちます。
  • 録音する：自分の声を録音し、発音やイントネーションを確認することで、より効果的なフィードバックを得ることができます。
  • shadowing siteを活用する：各種のリソースを活用し、より多くの文脈でシャドーイングを続けましょう。

このようにして、英語スピーキング技術を向上させ、自然な会話ができるようになります。uedesarrollo de "shadowspeak" を見つけて、他の英語の教材で今後も練習を続けていきましょう。

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。

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