跟讀練習: Why is the sky blue? - 通過影片學習英語口語

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Hi it's Doug.

I've got a plastic sandwich bag and I was noticing how

if you look through one plastic sandwich bag it's clear but

if you get a whole bunch of them check this out

now it's not clear it looks kind of blue you see

that the reason I have these plastic sandwich bags with me is

because I heard there's an interesting question this week from someone named Celine Let's give her a call now.

Hi, Doug.

Hi, Celine.

Good to see you.

Our class has a question for you.

Why is the sky blue?

That's a great question.

Before I say anything, I want you to stop and think about it.

What do you think?

Could you come up with any idea for why you think the sky is blue?

Now would be a good time to pause the video so that you can think and discuss this with someone near you.

Okay, you ready?

There are a lot of different ideas you could have come up with.

I can't guess all of the ideas you might have had, but I'll bet at least one of you thought, maybe the sky is blue because our oceans are blue.

Like, maybe the sky reflects the color of our oceans.

That's a really interesting idea.

There's actually a way to figure out if that's the reason.

Think about it.

If the color of the sky had to do with the color of Earth's surface, then if you were in the middle of a continent, surrounded by thousands of miles of land,

like this, then the sky shouldn't look blue at all, right?

It should actually look green, reflecting the color of all the land.

But that's not the case.

Even people who live in the middle of a whole bunch of land still see blue sky.

Why is the sky blue then?

This is a hard question to solve.

Scientists themselves didn't know for a long time.

Here's an interesting clue I can point out though.

We've sent spacecraft up to the moon and to other planets.

And it turns out the sky in those places isn't blue.

Have a look at the sky as seen from the moon.

Whoa, it's a black sky.

Okay, now let's check out what the sky looks like from Mars.

You ready?

Here it is.

Weird, it's kind of a yellowish sky.

So the Moon's sky and Mars' sky are somehow different from Earth's sky.

What's going on here?

Well, keep in mind, our own sky is made out of air.

It turns out the Moon has no air at all, so the sky just looks like outer space, even when you're on the surface of the Moon.

Now Mars' sky has air, but it's a different kind of air than what's found on Earth.

It's mostly made of a gas called carbon dioxide.

So the blue color of Earth's sky, this is a view from space, it has something to do with the kind of air that Earth has.

Our air is made of two gases.

It's got some oxygen.

That's the part of air that our bodies need to breathe in.

And Earth's air has a whole bunch of another gas, too, called nitrogen.

When the sunlight shines on all that oxygen and nitrogen, it looks blue to our eyes.

And the reason Mars' sky looks yellow is because of the gas that its sky is made of.

When sunlight shines on carbon dioxide, it looks yellow.

Now, I have to point something out.

This is not the full story.

There's more to this question.

It's complicated.

The reason that our planet's air looks blue also has something to do with how light works.

Look around you.

You're surrounded by Earth's air.

It's the same stuff that's in our sky.

But it doesn't look blue, does it?

No, it's clear.

You see, it matters how much air you're looking at.

When you look up at the sky you're looking at a

lot more air than just the air in the room around you.

Sometimes when you have a lot of something, like this water in a swimming pool, it can look different than when you just have a little bit of something, like this water in a glass of water.

It's also kind of like those plastic sandwich bags I was playing with earlier.

Just one of them looks clearer, but when you have a whole bunch of them the color looks different,

doesn't it it's interesting here's another thing to notice our sky

isn't always blue is it at the time around sunrise

or sunset you can see lots of different colors especially reddish orange color

all of this is something we can explore in a future episode

but as a first step toward understanding why our sky is blue you can just notice

that our sky is blue because of the type of air we have in our sky.

We can see for ourselves by comparing the color of our

sky with the color of the sky on other planets and the moon.

The way that light works, when you have a whole bunch of our type of air, it looks blue to our eyes.

Thanks, Selene, for asking that question.

Now, for the next episode, I reached into my question jar and found three questions submitted to me that I'm thinking about answering.

When this video is done playing, you'll get to vote on one.

you can choose from why do people have different eye colors

or if the earth is round why does it look flat

or how did alligators get their name so submit your vote

when the video is over I want to hear from all

of you watching now just like a lot of you are

taking a summer break I'm gonna take a break as well

but I'll be back in September remember there are mysteries all around you.

Have fun and stay curious.

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流利口語所需的一切

AI 發音評分逐句打分

音標練習掌握每個音

詞彙學習建立你的詞庫

詞彙遊戲邊玩邊學

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FOR YOU

本課的詞彙與口語要點

這段影片共有 91 個句子、1002 個單詞可供跟讀。講話部分時長為 6:03。說話人語速自然，每分鐘約 166 個詞，接近日常對話。 89% 的單詞屬於英語最常用的 3,000 詞，詞彙容易理解。

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
reflect 動詞	/ɹɪˈflɛkt/	反映, 反射
submit 動詞	/səbˈmɪt/	讓步 /讓步, 屈服
oxygen 名詞	/ˈɑksɪd͡ʒən/	氧
shine 動詞	/ʃaɪn/	發亮 /發亮, 照
sunlight 名詞	/ˈsʌnˌlaɪt/	陽光 /陽光, 日光
dioxide 名詞	/daɪˈɑksaɪd/	二氧化物
surround 動詞	/səˈɹaʊnd/	包圍 /包圍, 圍繞 /圍繞
nitrogen 名詞	/ˈnaɪ.tɹə.d͡ʒən/	氮, 氮氣 /氮氣
complicated 形容詞	/ˈkɑm.plɪˌkeɪ.tɪd/	複雜 /複雜
compare 動詞	/kəmˈpɛɚ/	比, 比較 /比較
curious 形容詞	/ˈkjʊɹ.i.əs/	好奇, 有好奇心
mystery 名詞	/ˈmɪs.t(ə.)ɹi/	謎 /謎, 謎團 /謎團
solve 動詞	/sɒlv/	解決 /解決
explore 動詞	/ɪkˈsploɹ/	探索, 探險 /探險
breathe 動詞	/bɹiːð/	呼吸, 吸

影片中出現的短語動詞

單詞	釋義
come up with 動詞	想出, 提出
turn out 動詞	原來 /原來
check out 動詞	退房
figure out 動詞	弄清楚
look around 動詞	環顧 /環顧
point out 動詞	指, 指出

需要注意的發音

說話人用了 19 次縮略和弱讀形式，例如 you're, doesn't, I'll。請按聽到的簡短形式來說。

“sh” 和 “zh” 音: shine /ʃaɪn/, reddish /ˈɹɛdɪʃ/, yellowish /ˈjɛlɔʊɪʃ/
長單詞——注意重音位置: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, alligator /ˈæl.ɪ.ɡeɪ.tɚ/

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 reflect, submit, oxygen 這類單詞。

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
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	is made
過去進行時 was/were + -ing — 過去某一時刻正在進行的動作	was noticing · was playing
現在進行時 am/is/are + -ing — 此刻或近期正在發生的事	you're looking · I'm thinking
“will” 表將來 will + 動詞 — 決定、承諾或預測	I'll bet · you'll get · I'll be

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。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: Why is the sky blue? - 通過影片學習英語口語

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