跟讀練習: Invisible ink science experiment - 通過影片學習英語口語
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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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本課的詞彙與口語要點
這節口語課以影片“Invisible ink science experiment”為素材。 影片中反覆出現的詞有：secret, turmeric, baking, soda, message。 這段影片共有 106 個句子、1095 個單詞可供跟讀。 講話部分時長為 7:15。 說話人語速自然，每分鐘約 151 個詞，接近日常對話。 83% 的單詞屬於英語最常用的 3,000 詞，其餘的詞建議在練習前先學一下。
影片中的重點詞彙
影片中 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| soda 名詞 | /ˈsoʊdə/ | 蘇打 /蘇打, 碳酸鈉 /碳酸鈉 |
| bake 動詞 | /beɪk/ | 烤, 烘 |
| reveal 動詞 | /ɹɪˈviːl/ | 透露, 顯示 /顯示 |
| friendship 名詞 | /ˈfɹɛn(d)ʃɪp/ | 友誼 /友誼, 友情 |
| explore 動詞 | /ɪkˈsploɹ/ | 探索, 探險 /探險 |
| curious 形容詞 | /ˈkjʊɹ.i.əs/ | 好奇, 有好奇心 |
| experiment 名詞 | /ɪkˈspɛɹ.ə.mənt/ | 實驗 /實驗 |
| finger 名詞 | /ˈfɪŋɡɚ/ | 手指, 指頭 /指頭 |
| trick 名詞 | /ˈtɹɪk/ | 詭計 /詭計, 騙術 /騙術 |
| acid 名詞 | /ˈæsɪd/ | 酸 |
| sheet 名詞 | /ʃit/ | 篇, 張 /張 |
| indicate 動詞 | /ˈɪndɪˌkeɪt/ | 表明, 表示 |
| carrier 名詞 | /ˈkæɹi.ɚ/ | 攜帶者 /攜帶者 |
| brush 名詞 | /bɹʌʃ/ | 刷子, 刷 |
| depend 動詞 | /dɪˈpɛnd/ | 信任, 信賴 /信賴 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| go ahead 動詞 | /ˌɡoʊ əˈhɛd/ | 請便 /請便 |
| check out 動詞 | 退房 |
值得反覆跟讀的句子
影片中簡短而完整的句子，可以直接用在日常對話裡：
- 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?
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | you've worked · I've written |
| 動詞 + -ing enjoy、keep、stop… + -ing — 後接 -ing 形式的動詞 | Keep exploring |
| 最高階 the -est / the most … — 一組中最高或最低的 | our best · the best |
| “going to” 表將來 be going to + 動詞 — 計劃或明顯即將發生的事 | are going to draw · are going to reveal · are going to make |
需要注意的發音
說話人用了 34 次縮略和弱讀形式，例如 I'm, we're, don't。請按聽到的簡短形式來說。
- “sh” 和 “zh” 音: friendship /ˈfɹɛn(d)ʃɪp/, sheet /ʃit/, brush /bɹʌʃ/, caution /ˈkɔːʃ(ə)n/, paintbrush /ˈpeɪntˌbɹʌʃ/
- 長單詞——注意重音位置: experiment /ɪkˈspɛɹ.ə.mənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, ingredient /ɪnˈɡɹiːdi.ənt/, bicarbonate /baɪˈkɑɹ.bə.neɪt/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: reveal /ɹɪˈviːl/, dissolve /dɪˈzɑlv/, secretive /ˈsiːkɹɪtɪv/
- 詞尾子音 — 要讀清楚，後面不要加母音: bake /beɪk/, friendship /ˈfɹɛn(d)ʃɪp/, curious /ˈkjʊɹ.i.əs/, experiment /ɪkˈspɛɹ.ə.mənt/, trick /ˈtɹɪk/
- /r/ 和 /l/ 的區別: reveal /ɹɪˈviːl/, explore /ɪkˈsploɹ/, ripple /ˈɹɪp(ə)l/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
- 錄下自己的聲音並與原聲對比，特別注意 soda, bake, reveal 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。