シャドーイング練習: Science in English #4 | Compounds and chemical formulas - 動画で英語スピーキングを学ぶ
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45 文
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1
Good morning, everyone.
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Today we are going to learn about compounds and chemical formulas.
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We will discover how different elements combine to form new substances.
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Let's get started.
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Let's begin with a simple comparison.
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The English language has only 26 letters, yet those letters can create millions of words and sentences.
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Nature is very similar.
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About 118 elements combine to create millions of different substances.
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So, what do we call these new substances?
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Today, we will find out.
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Let's begin with our learning objectives.
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By the end of this lesson, you will understand what a compound is.
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You will learn about chemical bonds.
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You will recognize a molecule.
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You will also learn how to read chemical formulas.
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So what is a compound?
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A compound is a substance made from the chemical combination of two or more different elements.
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When different elements join together, they form a completely new substance.
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Let's look at some examples.
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Water, or H2O, is a compound.
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It is made from hydrogen and oxygen.
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carbon dioxide, or CO2, is another compound.
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It is made from carbon and oxygen.
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Compounds are all around us in our everyday lives.
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How do atoms stay together?
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They are connected by a chemical bond.
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A group of bonded atoms is called a molecule.
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A water molecule has two hydrogen atoms and one oxygen atom.
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A chemical formula shows the number of atoms in one molecule.
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The small number is called a subscript.
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It tells us how many atoms of each element are present.
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For example, H2O, CO2, and C12H22O11 are all chemical formulas.
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Now let's compare.
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H2O is a compound.
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CO2 is also a compound.
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But O2 is not a compound.
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Why?
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Because it contains only one element.
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A compound must contain two or more different elements.
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Let's review what we have learned today.
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Compounds are made from two or more different elements.
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Atoms are connected by chemical bonds.
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A molecule is the smallest unit of many compounds.
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Chemical formulas show the fixed ratio of atoms.
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Thank you for listening.
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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
この動画には、シャドーイング用の文が45文、単語が341語あります。 音声の長さは2:51です。 話す速さは1分あたり約120語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は74%だけなので、語彙は難しめです。
この動画の重要語彙
動画に出てくるやや難しい単語15語を、発音と意味つきで紹介します。
- compound /ˈkɑmpaʊnd/ (名詞) — 化合物. Anything made by combining several things.
- element /ˈɛləmənt/ (名詞) — 要素, エレメント. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.
- atom /ˈætəm/ (名詞) — 原子, アトム. The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
- formula /ˈfɔː.mjʊ.lə/ (名詞) — 公式, 定式. Any mathematical rule expressed symbolically.
- substance /ˈsʌbstəns/ (名詞) — 物質. Physical matter; material.
- molecule /ˈmɑ.lɪ.kjul/ (名詞) — 分子. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by…
- oxygen /ˈɑksɪd͡ʒən/ (名詞) — 酸素. The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental…
- connect /kəˈnɛkt/ (動詞) — 繋げる. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
- combine /kəmˈbaɪn/ (動詞) — 合わせる, 結び付ける. To bring (two or more things or activities) together; to unite.
- hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/ (名詞) — 水素. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
- lesson /ˈlɛs.ən/ (名詞) — 授業, 学科. A section of learning or teaching into which a wider learning content is divided.
- compare /kəmˈpɛɚ/ (動詞) — 比べる, 比較する. To assess the similarities and differences between two or more things [“to compare X with Y”]. Having made the comparison of X with Y, one might have found it…
- discover /dɪˈskʌvə/ (動詞) — 発見する, 見つける. To find or learn something for the first time.
- ratio /ˈɹeɪ.ʃoʊ/ (名詞) — 比. A number representing a comparison between two named things.
- objective /ɒbˈd͡ʒɛk.tɪv/ (名詞) — 目標, 目的. A material object that physically exists.
動画に出てくる句動詞
- find out (動詞) — 見出す, 調べる. To discover, as by asking or investigating.
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。
- 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
- 自分の声を録音して元の音声と比べます。compound, element, atomなどの単語に特に注意しましょう。
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 | is made · are connected · is called |
| 「will」の未来表現 will + 動詞 — その場の決定、約束、予測 | will discover · will find · will understand |
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。