跟读练习: Invisible ink science experiment - 通过视频学习英语口语
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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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本课的词汇与口语要点
这节口语课以视频“Invisible ink science experiment”为素材。 视频中反复出现的词有：secret, turmeric, baking, soda, message。 这段视频共有 106 个句子、1095 个单词可供跟读。 讲话部分时长为 7:15。 说话人语速自然，每分钟约 151 个词，接近日常对话。 83% 的单词属于英语最常用的 3,000 词，其余的词建议在练习前先学一下。
视频中的重点词汇
视频中 15 个值得学习的单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| soda 名词 | /ˈsoʊdə/ | 蘇打 /苏打, 碳酸鈉 /碳酸钠 |
| bake 动词 | /beɪk/ | 烤, 烘 |
| reveal 动词 | /ɹɪˈviːl/ | 透露, 顯示 /显示 |
| friendship 名词 | /ˈfɹɛn(d)ʃɪp/ | 友誼 /友谊, 友情 |
| explore 动词 | /ɪkˈsploɹ/ | 探索, 探險 /探险 |
| curious 形容词 | /ˈkjʊɹ.i.əs/ | 好奇, 有好奇心 |
| experiment 名词 | /ɪkˈspɛɹ.ə.mənt/ | 實驗 /实验 |
| finger 名词 | /ˈfɪŋɡɚ/ | 手指, 指頭 /指头 |
| trick 名词 | /ˈtɹɪk/ | 詭計 /诡计, 騙術 /骗术 |
| acid 名词 | /ˈæsɪd/ | 酸 |
| sheet 名词 | /ʃit/ | 篇, 張 /张 |
| indicate 动词 | /ˈɪndɪˌkeɪt/ | 表明, 表示 |
| carrier 名词 | /ˈkæɹi.ɚ/ | 攜帶者 /携带者 |
| brush 名词 | /bɹʌʃ/ | 刷子, 刷 |
| depend 动词 | /dɪˈpɛnd/ | 信任, 信賴 /信赖 |
视频中出现的短语动词
| 单词 | 发音 | 释义 |
|---|---|---|
| go ahead 动词 | /ˌɡoʊ əˈhɛd/ | 請便 /请便 |
| check out 动词 | 退房 |
值得反复跟读的句子
视频中简短而完整的句子，可以直接用在日常对话里：
- 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?
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事 | you've worked · I've written |
| 动词 + -ing enjoy、keep、stop… + -ing — 后接 -ing 形式的动词 | Keep exploring |
| 最高级 the -est / the most … — 一组中最高或最低的 | our best · the best |
| “going to” 表将来 be going to + 动词 — 计划或明显即将发生的事 | are going to draw · are going to reveal · are going to make |
需要注意的发音
说话人用了 34 次缩略和弱读形式，例如 I'm, we're, don't。请按听到的简短形式来说。
- “sh” 和 “zh” 音: friendship /ˈfɹɛn(d)ʃɪp/, sheet /ʃit/, brush /bɹʌʃ/, caution /ˈkɔːʃ(ə)n/, paintbrush /ˈpeɪntˌbɹʌʃ/
- 长单词——注意重音位置: experiment /ɪkˈspɛɹ.ə.mənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, ingredient /ɪnˈɡɹiːdi.ənt/, bicarbonate /baɪˈkɑɹ.bə.neɪt/
中文母语者容易读错的音：
- /v/ — 不要读成 /w/，上齿轻触下唇: reveal /ɹɪˈviːl/, dissolve /dɪˈzɑlv/, secretive /ˈsiːkɹɪtɪv/
- 词尾辅音 — 要读清楚，后面不要加元音: bake /beɪk/, friendship /ˈfɹɛn(d)ʃɪp/, curious /ˈkjʊɹ.i.əs/, experiment /ɪkˈspɛɹ.ə.mənt/, trick /ˈtɹɪk/
- /r/ 和 /l/ 的区别: reveal /ɹɪˈviːl/, explore /ɪkˈsploɹ/, ripple /ˈɹɪp(ə)l/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 soda, bake, reveal 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。