シャドーイング練習: Rock Candy! - 動画で英語スピーキングを学ぶ
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121 文
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Have you ever wanted to make your own rock candy?
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Well, today I am going to teach you how with my rock candy science experiment.
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Hi everyone, I'm Emily Calandrelli, MIT engineer and host of Emily's Flunder Lab.
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And on my channel, we learn about all things space and science.
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So grab your sugar and get ready for some sweet science.
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Today I'm going to teach
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you how to make colorful rock candy sticks using science here's
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what you need rock candy sticks one cup of water three
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cups of white granulated sugar plus a little extra to sprinkle
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on your rock candy sticks a few different glasses some clothes pins
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and some food coloring the first thing
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you want to do is you want to get the bottom third of your rock candy sticks wet
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you can do this by running it under water in the sink
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i'm just going to do it like this here
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and then after you do
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that for a few seconds lay them out on a plate just like that
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and we are going to sprinkle some sugar on top of them
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you just want to completely coat your rock candy sticks get
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as much sugar on there as possible might be a little overkill
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but that's okay just go ahead
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and roll it around in the sugar set your rock candy
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sticks aside to dry for at least an hour ideally overnight once your candy sticks are completely dry
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you are ready to make your saturated solution of sugar here's how you do
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that add one cup of water to a pot
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and then add three cups of white granulated sugar one stir
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that in so that it dissolves
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and as we heat this up this will dissolve even better there's two stir
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that in what we are doing here is we are saturating the solution meaning
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we're adding as much sugar as humanly possible to this water at this temperature
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it will not be able to even
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if it wanted to dissolve more sugar stir
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that in now put your heat on high what we want to do is bring our solution to a boil
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and allow it to boil for two minutes.
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Now that your solution is boiling, give it a good mix.
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Make sure all of that sugar has dissolved.
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And after that two minute timer is up, go ahead and turn your soap top off.
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And we're going to let this cool for about 15 minutes before we transfer it to our glasses.
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As your solution cools, we can prepare our glasses with our rot candy sticks.
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So go ahead and we want it to look like this.
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We want it to be suspended in the glass not touching the bottom
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and not touching the sides and clothespins work really well for this.
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For bigger glasses I'll show you how to do it.
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So we have a rock candy stick that has dried overnight.
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One clothespin here I'm going to measure make sure it's not touching the bottom there.
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I'm going to do one of these and then a second one right here and place it right in the center there.
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So now that they are all prepared
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and they're not touching the bottom they're not touching the sides go ahead
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and take them out
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because we are going to put our sugar solution in the glasses one thing
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you can do to prepare your glasses for the still pretty
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hot solution is to run them under hot water to make sure
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that you're not going to break your glasses by pouring in the hot sugar solution
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because we were measuring our rock candy sticks in here just clean them out make sure
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there's no more sugar inside your glasses and just like
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that you are ready to pour in your saturated sugar solution
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so very carefully
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because it'll still be a little hot pour it into as many glasses as you like careful with the glasses
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because they will be hot
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and depending on the size of your glasses you may have more glasses
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you may have less now for the fun part we are going to make this colorful I'm going to use purple,
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stir it with a spoon.
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Oh, beautiful.
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Look at that.
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Stir it up. And then finally, blue.
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Now we are ready to put in our rock candy sticks into the solution
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and I recommend putting the glasses where you're going to leave them for the next seven days
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because we ideally you would leave these sitting letting them crystallize for a week.
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The science experiment takes patience but the end result.
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It's pretty amazing.
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So go ahead, once they're there where you want them, carefully, slowly place your rock candy stick in the solution.
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You want to cover up as much of the stick as possible.
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I have found that long skinny glasses work really well for this because you're not using as much solution, but you're covering that entire rock stick.
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Our beautiful blue one.
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So now we just wait.
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And what's going to happen as we wait over the next few days?
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Well, crystals are going to start building on your rock candy sticks because the solution is going to cool.
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Why does that matter?
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Well, hot sugar solution can hold more sugar than cold sugar solution.
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And as the solution cools, that sugar is going to want to jump out of the solution to undissolve from the solution.
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That's why we covered our rock candy sticks with sugar, because that sugar that wants to undissolve, it wants to hold on to something.
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And that little something was our seed crystals on our rot candy sticks.
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So day by day, you will see more crystals building on your sticks.
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And after the first day, they're a little bit small, but be patient because they get bigger and bigger and bigger.
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And at the end of a week, you'll have a very beautiful rot candy crystal.
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These were some rot candy crystals I prepared ahead of time.
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And after a few days of waiting, it'll look like this.
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You'll notice some crystals growing on your rock candy stick,
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but you'll also notice some sugar crystals on the bottom of the glass and right on the surface.
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So to get your rock candy out, you want to take your clothespin
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and just kind of break the surface of the sugar just like
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that because we just want to be able to pull our stick out easily.
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once you've done that wiggle your candy stick around
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and take it out and you'll notice it's still dripping
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that sugar liquid there get your clothespin bring it to another glass
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and let it drip for just like 10 minutes that's all you need
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and then once
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that happens you'll be able to have a delicious rock candy crystal this one has been waiting in
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that solution for about three days
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so you can tell it's not very big that's why patience is key with this experiment
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this one has only been in there for about two days so it's quite small and a word to the wise
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use rot candy sticks instead of skewers we use skewers here and you'll notice some variability
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because they have a hard time holding on to the sugar
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when we coated our sticks with sugar at the start for our seed crystals.
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Some of them stayed on.
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Some of them fell off.
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Rot candy sticks are much better at this.
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So when you're shopping, get rot candy sticks.
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Our sugar solution became super saturated as it cooled down and created all of these beautiful crystals.
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This one was waiting for two days.
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This one was three days.
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These were all four days.
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And this big guy was eight days.
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You can see it mostly collected at the top here
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because again we used a skewer and all of those seed crystals fell off of the bottom.
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So none of the crystals grew down here, but they very much grew up there, creating quite the unique crystal.
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Very cool.
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These sugar crystals have these beautiful geometric shapes because crystals occur when atoms arrange themselves in highly organized repeating patterns,
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creating these beautiful geometric shapes thank you for making rock candy with me today
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if you like this one be sure to check out my best -selling stay curious
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and keep exploring book series for 99 more science experiments i'm emily calendrelli subscribe for all things science
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and space and remember stay curious and keep exploring i'll see you next time
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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
繰り返し出てくる語は次のとおりです：candy, sugar, stick, solution, rock。 この動画には、シャドーイング用の文が121文、単語が1436語あります。 音声の長さは8:52です。 話す速さは1分あたり約162語で、日常会話に近い自然なペースです。 単語の85%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 |
|---|---|---|
| candy 名詞 | /ˈkæn.di/ | キャンデー, キャンディ |
| crystal 名詞 | /ˈkɹɪstəl/ | 結晶 |
| stir 動詞 | /stɝ/ | 掻き混ぜる, 攪拌する |
| experiment 名詞 | /ɪkˈspɛɹ.ə.mənt/ | 実験 |
| pour 動詞 | /poɹ/ | 注ぐ |
| boil 動詞 | /bɔɪ(ə)l/ | 沸かす, 沸騰させる |
| saturated 形容詞 | 飽和した | |
| carefully 副詞 | /ˈkɛɹf(ə)li/ | じっくり, 慎重に |
| curious 形容詞 | /ˈkjʊɹ.i.əs/ | 好奇心の強い, 知りたがる |
| coat 名詞 | /ˈkoʊ̯t/ | コート, 外套 |
| explore 動詞 | /ɪkˈsploɹ/ | 探検する |
| patience 名詞 | /ˈpeɪ̯.ʃəns/ | 辛抱, 忍耐 |
| overnight 副詞 | /əʊvə(ɹ)ˈnaɪt/ | 一夜 |
| colorful 形容詞 | /ˈkʌl.əɹ.fl̩/ | カラフル |
| drip 動詞 | /ˈdɹɪp/ | 滴る |
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 | |
| cool down 動詞 | /kuːl ˈdaʊn/ | 冷める, 冷える |
| grow up 動詞 | 成長する, 大人に成る | |
| stick out 動詞 | 突き出る |
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 | Have you ever wanted · has dissolved · has dried |
| 「might / may」による可能性 might/may + 動詞 — 起こりうるが確実ではないこと | might be · may have |
| 過去進行形 was/were + -ing — 過去のある時点で進行中だった動作 | were measuring · was waiting |
| 動詞 + -ing enjoy, keep, stop… + -ing — 後ろに-ing形が続く動詞 | keep exploring |
注意したい発音
話し手はI'm, you'll, you'reなど、短縮形や弱形を29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: patience /ˈpeɪ̯.ʃəns/, delicious /dɪˈlɪ.ʃəs/
- 長い単語（アクセントの位置に注意）: experiment /ɪkˈspɛɹ.ə.mənt/, ideally /aɪˈdi.ə.li/, geometric /ˌd͡ʒiː.əʊˈmɛt.ɹɪk/, variability /ˌvæɹ.i.əˈbɪl.ə.ti/
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: crystal /ˈkɹɪstəl/, carefully /ˈkɛɹf(ə)li/, explore /ɪkˈsploɹ/, colorful /ˈkʌl.əɹ.fl̩/, granulate /ˈɡɹæn.jul.eɪt/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: overnight /əʊvə(ɹ)ˈnaɪt/, dissolve /dɪˈzɑlv/, overkill /ˈoʊ.vɚˌkɪl/, variability /ˌvæɹ.i.əˈbɪl.ə.ti/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: carefully /ˈkɛɹf(ə)li/, colorful /ˈkʌl.əɹ.fl̩/
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。candy, crystal, stir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。