シャドーイング練習: Biology: Cell Structure I Nucleus Medical Media - 動画で英語スピーキングを学ぶ
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62 文
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1
Cells are the smallest living units of an organism.
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All cells have three things in common, no matter what type of cell they are.
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All cells have a cell membrane, which separates the inside of the cell from its environment,
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cytoplasm, which is a jelly-like fluid, and DNA, which is the cell's genetic material.
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There are two broad categories of cells.
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The first category is eukaryotic cells.
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They have organelles, which include the nucleus and other special parts.
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Eukaryotic cells are more advanced, complex cells, such as those found in plants and animals.
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The second category is prokaryotic cells.
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They don't have a nucleus or membrane-enclosed organelles.
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They do have genetic material, but it's not contained within a nucleus.
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Prokaryotic cells are always one-celled or unicellular organisms, such as bacteria. So, what are organelles?
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Organelle means little organ.
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Organelles are the specialized parts of a cell that have unique jobs to perform.
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Let's start with the nucleus, the control center of the cell.
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The nucleus contains DNA, or genetic material.
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DNA dictates what the cell is going to do and how it's going to do it.
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Chromatin is the tangled, spread out form of DNA found inside the nuclear membrane.
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When a cell is ready to divide, DNA condenses into structures known as chromosomes.
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The nucleus also contains a nucleolus, which is a structure where ribosomes are made.
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After ribosomes leave the nucleus, they will have the important job of synthesizing or making proteins.
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Outside the nucleus, the ribosomes and the rest of the organelles float around in cytoplasm, which is the jelly-like substance.
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may wander freely within the cytoplasm or attach to the endoplasmic reticulum, sometimes abbreviated as ER.
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There are two types of ER.
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Rough ER has ribosomes attached to it, and smooth ER doesn't have ribosomes attached to it.
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The endoplasmic reticulum is a membrane-enclosed passageway for transporting materials, such as the proteins synthesized by ribosomes.
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Proteins and other materials emerge from the endoplasmic reticulum in small vesicles,
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where the Golgi apparatus, sometimes called the Golgi body, receives them.
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As proteins move through the Golgi body, they're customized into forms that the cell can use.
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The Golgi body does this by folding the proteins into usable shapes
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or adding other materials onto them such as lipids or carbohydrates.
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Vacuoles are sac-like structures that store different materials.
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Here in this plant cell, the central vacuole stores water.
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Going back to the animal cell, you will see an organelle called a lysosome.
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Lysosomes are the garbage collectors that take in damaged or worn out cell parts.
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They are filled with enzymes that break down this cellular debris.
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The mitochondrion is an organelle that is the powerhouse for both animal and plant cells.
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During a process called cellular respiration,
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the mitochondria make ATP molecules that provide the energy for all of the cell's activities.
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Cells that need more energy have more mitochondria.
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Meanwhile, the cell maintains its shape through a cytoskeleton.
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The cytoskeleton includes the thread-like microfilaments, which are made of protein,
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and microtubules, which are thin, hollow tubes.
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Some organisms, such as plants that are photoautotrophic, meaning they capture sunlight for energy,
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have cells with an organelle called a chloroplast.
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The chloroplast is where photosynthesis happens.
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It's green because it has a green pigment called chlorophyll.
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Plant cells also have a cell wall outside of their cell membranes that shape, support and protect the plant cell.
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Animal cells never have a cell wall.
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There are many other unique structures that only some cells have.
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Here are just a few.
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In humans, for example, the respiratory tract is lined with cells that have cilia.
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These are microscopic, hair-like projections that can move in waves.
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This feature helps trap inhaled particles in the air and expels them when you cough.
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Another unique feature in some cells is flagella.
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Some bacteria have flagella.
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A flagellum is like a little tail that can help a cell move or propel itself.
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The only human cell that has a flagellum is a sperm cell.
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In summary, remember, eukaryotic cells are plant and animal cells with a nucleus and membrane-enclosed organelles,
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while prokaryotic cells are unicellular organisms without these things.
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All cells have a cell membrane, cytoplasm, and genetic material.
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And even though only plant cells have chloroplasts, both plant and animal cells have mitochondria.
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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C1レベルのスピーキングレッスンは、動画「Biology: Cell Structure I Nucleus Medical Media」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：cell, organelle, nucleus, plant, material。 この動画には、シャドーイング用の文が62文、単語が728語あります。 音声の長さは6:54です。 話す速さはゆっくりで、1分あたり約105語です。一つ一つの音をまねる余裕があります。 英語の頻出3,000語に含まれる単語は72%だけなので、語彙は難しめです。
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 |
|---|---|---|
| organelle 名詞 | /ˌɔɹ.ɡənˈɛl/ | 細胞小器官 |
| nucleus 名詞 | /ˈnuː.kli.əs/ | 核, 核心 |
| ribosome 名詞 | /ˈɹaɪbəˌsoʊm/ | リボソーム |
| membrane 名詞 | /ˈmɛm.bɹeɪn/ | 膜 |
| cytoplasm 名詞 | /ˈsaɪtəʊˌplæzəm/ | 細胞質 |
| flagellum 名詞 | /fləˈd͡ʒɛləm/ | 鞭毛 |
| mitochondrion 名詞 | /ˌmaɪtəˈkɑndɹiən/ | ミトコンドリア, 糸粒体 |
| organism 名詞 | /ˈɔɹ.ɡəˌnɪz.əm/ | 生物, 有機体 |
| chloroplast 名詞 | /ˈklɔːɹəʊˌplæst/ | 葉緑体 |
| reticulum 名詞 | ハチノス | |
| attach 動詞 | /əˈtæt͡ʃ/ | 付ける, 添付する |
| bacterium 名詞 | /bækˈtɪəɹ.ɪəm/ | 細菌, バクテリア |
| cytoskeleton 名詞 | 細胞骨格 | |
| lysosome 名詞 | /ˈlaɪsəˌsoʊm/ | リソソーム, 水解小体 |
| synthesize 動詞 | /ˈsɪnθəsaɪz/ | 総合する |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| wear out 動詞 | 擦り減らす |
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 |
|---|---|
| 関係詞節 who / which + 節 — 人や物について情報を加える | cytoplasm, which is · nucleolus, which is · microfilaments, which are |
| 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 | are made · are filled · is lined |
注意したい発音
話し手はdoesn't, don't, they'reなど、短縮形や弱形を3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。
- 「th」の音: synthesize /ˈsɪnθəsaɪz/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/
- 「sh」と「zh」の音: respiration /ɹɛspɪˈɹeɪʃən/, specialize /ˈspɛʃəˌlaɪz/, projection /pɹəˈd͡ʒɛkʃən/
- 長い単語（アクセントの位置に注意）: cytoplasm /ˈsaɪtəʊˌplæzəm/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, organism /ˈɔɹ.ɡəˌnɪz.əm/, unicellular /ˌjuːnɪˈsɛljʊlə(ɹ)/, abbreviate /əˈbɹi.vi.eɪt/
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: organelle /ˌɔɹ.ɡənˈɛl/, chloroplast /ˈklɔːɹəʊˌplæst/, unicellular /ˌjuːnɪˈsɛljʊlə(ɹ)/, chlorophyll /ˈklɔɹ.ə.fɪl/, microfilament /ˈmaɪkrəʊˌfɪləmənt/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: vacuole /ˈvækjʊˌəʊl/, abbreviate /əˈbɹi.vi.eɪt/, vesicle /ˈvɛsɪkəl/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: flagellum /fləˈd͡ʒɛləm/, chlorophyll /ˈklɔɹ.ə.fɪl/, microfilament /ˈmaɪkrəʊˌfɪləmənt/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/, float /fləʊt/
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。organelle, nucleus, ribosome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。