シャドーイング練習: Invisible ink science experiment - 動画で英語スピーキングを学ぶ
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106 文
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Has your kid ever wanted to be a spy or maybe write secret coded notes to their siblings or their friends?
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Well, today I have an experiment for exactly that called secret friendship notes.
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Hi everyone, I'm Emily Calandrelli, MIT engineer and host of Emily's Wonder Lab.
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And on my channel, we learn about all things space and science.
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So grab some turmeric because we are about to go on a mission.
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Keep exploring.
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And this sounds like.
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Skate carrier.
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And keep exploring.
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Today for our secret friendship notes, we are going to draw a secret message with a baking soda solution, set it aside to dry,
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and then once it's dry, we are going to reveal it with a turmeric solution.
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Okay?
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So for our baking soda solution, what you need is one cup of water plus one tablespoon of baking soda.
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To draw your message, you'll want a few paintbrushes, and then later for your turmeric solution,
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you want one half cup water with one teaspoon of turmeric.
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And parents and adults, if you've worked with turmeric before, you know that it stains everything.
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Fingers and counters and bowls and basically anything it touches.
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So please exercise caution here.
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It is why I have my tinfoil on the counter because I'm trying to save this counter from the turmeric.
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So just be careful here.
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So first, we are going to make our baking soda solution.
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This is going to be our paint that we paint the secret message
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that you're not going to be able to see after it dries.
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So let's go ahead and do one cup of water.
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Right in a bowl.
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And now, let's add one tablespoon of baking soda.
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Just like this.
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And then go ahead and mix it up.
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You'll notice that the baking soda won't completely dissolve in the water, and that's okay.
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If you have a little bit of baking soda on the bottom, that's all right.
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We're just trying to create as much of a baking soda solution as we can
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because it's the baking soda that is the very key ingredient to our secret message here.
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Once you've mixed that up about as good as you can, we're going to take our paintbrush and use this
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and our baking soda solution to write our secret message on a piece of computer paper.
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So I'm going to take one sheet of computer paper here,
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set this aside and write my message here trying to get as much baking soda on your paintbrush as you can.
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Tap it off.
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You don't want it to be too wet.
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Okay, now that I've written my secret message, I'm going to set it aside to dry.
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It'll take between 10 minutes to an hour, really depending on how much water you use on your paper.
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But if you want this message to be completely secret,
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You want it to be completely dry because once it's completely dry because the baking soda is white
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It's so hard to see this is the secret part of these secret friendship notes
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So try to let it completely dry before you move on to the next step
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Once your secret friendship note is dry
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You can give it to a friend with the magic reveal paint and the magic reveal paint is our turmeric solution
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So let's go ahead and make that we're going to do one half cup water there plus plus one teaspoon turmeric.
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I'm using my one half teaspoon here because it fits in the turmeric because I'm just trying to avoid spills here.
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One half teaspoon plus, plus one half teaspoon equals one teaspoon.
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I'm gonna go ahead and mix this up.
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Again, it'll be a little clumpy.
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This is because turmeric is not soluble in water.
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It's soluble in alcohol, but we're just gonna do our best here.
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We just wanna suspend the turmeric in the water as best we can.
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Now here's the fun part.
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So we're going to take our turmeric solution
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and with a big paintbrush you're going to tell your friend
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that to reveal the secret message they just need to paint the paper with the magic reveal paint.
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You just want to go ahead and paint the entire thing.
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I'm going to take my secret message here and I'm just going to paint on top of it.
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Because look at this.
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It's very hard to see what this says.
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Right?
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What is my secret note saying?
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I don't know.
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Let's reveal it.
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Here we go.
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Look at that.
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Look at the turmeric reacting with our baking soda here.
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Do you see what's happening?
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Look at this.
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Everywhere that our turmeric is touching the paper, it's yellow, kind of what you would expect, like the color of turmeric.
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But when it touches the part where we had baking soda, do you see the color it turned?
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It turns red.
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Why does that happen?
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Well, it's because turmeric is something known as a natural pH indicator.
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which means it changes colors when it's in the presence of an acid and a base.
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What is baking soda?
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Well, it's sodium bicarbonate or a base.
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And so when turmeric interacts with baking soda, it turns red.
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It goes from yellow to red to indicate that it is in the presence of a base.
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Here's a trick to make your secret note even more secretive use cardstock
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because cardstock doesn't absorb the water as much so you don't have those obvious ripples in the paper.
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It takes a little longer for the water to dry but once it does it's even harder to see your message.
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So let's go ahead and reveal this one.
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Get my turmeric secret reveal paint on my paintbrush.
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Watch with each brush stroke I'm revealing a part of my secret message.
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You see what it says here?
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It says, Stay curious and keep exploring.
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You send your friend this message, but they have no idea what it says.
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You tell them to reveal it with your magic turmeric paint.
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Let's see.
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You see what it says?
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Meat in the treehouse.
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Home.
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And the best part is that your secret friendship note smells amazing.
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Very spicy.
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Smells great.
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Thank you for making secret friendship notes with me.
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If you like this one, be sure to check out my bestselling
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Stay Curious and Keep Exploring book series for 99 more science experiments.
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I'm Emily Calandrelli.
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Subscribe for all things science and space.
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And remember, stay curious and keep exploring.
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I'll see you next time.
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Emily's Science Lab
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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「Invisible ink science experiment」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：secret, turmeric, baking, soda, message。 この動画には、シャドーイング用の文が106文、単語が1095語あります。 音声の長さは7:15です。 話す速さは1分あたり約151語で、日常会話に近い自然なペースです。 単語の83%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。
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 |
|---|---|---|
| soda 名詞 | /ˈsoʊdə/ | ソーダ, 炭酸ナトリウム |
| bake 動詞 | /beɪk/ | 焼く |
| reveal 動詞 | /ɹɪˈviːl/ | 現す, 表す |
| friendship 名詞 | /ˈfɹɛn(d)ʃɪp/ | 友情, 友好 |
| explore 動詞 | /ɪkˈsploɹ/ | 探検する |
| curious 形容詞 | /ˈkjʊɹ.i.əs/ | 好奇心の強い, 知りたがる |
| experiment 名詞 | /ɪkˈspɛɹ.ə.mənt/ | 実験 |
| finger 名詞 | /ˈfɪŋɡɚ/ | 指 |
| trick 名詞 | /ˈtɹɪk/ | 欺き, 企み |
| acid 名詞 | /ˈæsɪd/ | 酸 |
| sheet 名詞 | /ʃit/ | 枚, シート |
| indicate 動詞 | /ˈɪndɪˌkeɪt/ | 示す, 指す |
| brush 名詞 | /bɹʌʃ/ | 刷子, 刷毛 |
| depend 動詞 | /dɪˈpɛnd/ | 依存する |
| interact 動詞 | /ɪn.təˈɹækt/ | 相互作用する, 相呼応する |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| go ahead 動詞 | /ˌɡoʊ əˈhɛd/ | どうぞお先に |
| check out 動詞 | 試験する, 検査する |
繰り返し練習したい文
動画に出てくる短く完結した文です。日常会話でそのまま使えます。
- You don't want it to be too wet.
- What is my secret note saying?
- Do you see what's happening?
- You see what it says here?
- You see what it says?
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 |
|---|---|
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | you've worked · I've written |
| 動詞 + -ing enjoy, keep, stop… + -ing — 後ろに-ing形が続く動詞 | Keep exploring |
| 最上級 the -est / the most … — グループの中で一番 | our best · the best |
| 「going to」の未来表現 be going to + 動詞 — 予定や、起こりそうだと分かること | are going to draw · are going to reveal · are going to make |
注意したい発音
話し手はI'm, we're, don'tなど、短縮形や弱形を34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: friendship /ˈfɹɛn(d)ʃɪp/, sheet /ʃit/, brush /bɹʌʃ/, caution /ˈkɔːʃ(ə)n/, paintbrush /ˈpeɪntˌbɹʌʃ/
- 長い単語（アクセントの位置に注意）: experiment /ɪkˈspɛɹ.ə.mənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, ingredient /ɪnˈɡɹiːdi.ənt/, bicarbonate /baɪˈkɑɹ.bə.neɪt/
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: reveal /ɹɪˈviːl/, explore /ɪkˈsploɹ/, ripple /ˈɹɪp(ə)l/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: reveal /ɹɪˈviːl/, dissolve /dɪˈzɑlv/, secretive /ˈsiːkɹɪtɪv/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: friendship /ˈfɹɛn(d)ʃɪp/, finger /ˈfɪŋɡɚ/
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。soda, bake, reveal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。