跟讀練習: Why Does the Sky Turn Red at Sunset? - 通過影片學習英語口語

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Have you ever looked outside just before the sun disappears and noticed the sky suddenly turning orange, red or even pink?

It can look almost unreal, especially when the clouds catch the sunlight and seem to glow.

But why does the sky change color at sunset when it looks blue for most of the day?

The answer has to do with sunlight, Earth's atmosphere, and the way different colors of light travel through the air.

And surprisingly, the beautiful red sunset we see is created by the same atmosphere that gives us our familiar blue daytime sky.

So, today we'll uncover, why does the sky turn red at sunset?

What exactly happens to sunlight as the sun moves toward the horizon?

Let's take a closer look, right here, on History of Simple Things.

To understand a sunset, we first need to understand sunlight.

Although sunlight appears white to our eyes, it is actually made up of many different colors of visible light.

You can think of sunlight as a mixture of red, orange, yellow, green, blue, and violet light.

Each color has a different wavelength.

Red light has a longer wavelength, while blue and violet light have much shorter wavelengths.

When sunlight travels through space, these different colors generally move together.

But once sunlight enters Earth's atmosphere, things become more interesting.

The atmosphere contains countless tiny molecules, especially nitrogen and oxygen.

When sunlight passes through these molecules, some of the light is scattered in different directions.

And this scattering is the key to understanding both blue skies and red sunsets.

During most of the day, sunlight reaches us after traveling through a relatively short path through the atmosphere.

The shorter wavelengths, particularly blue and violet, are scattered much more strongly than the longer wavelengths, such as red and orange.

This process is called Rayleigh scattering.

So instead of all the sunlight traveling directly from the sun to our eyes, some of the blue light gets scattered across the sky.

Our eyes are more sensitive to blue than violet, and some violet light is also absorbed or distributed differently in the atmosphere.

As a result, the sky generally appears blue.

This is why, when you look away from the sun on a clear day, you're not seeing empty blue space.

You're seeing sunlight that has been scattered through the atmosphere.

But as sunset approaches, the path sunlight takes through the atmosphere changes dramatically.

As Earth rotates, the sun appears to move lower and lower toward the horizon.

The important thing is that the sun isn't simply becoming weaker because it's farther away.

Instead, sunlight has to travel through much more atmosphere before reaching your eyes.

Imagine shining a flashlight through a short layer of fog.

Most of the light can pass through fairly easily.

Now, imagine sending that same flashlight through a much longer layer of fog.

More of the light gets scattered or absorbed along the way.

Something similar happens during sunset.

When the sun is high overhead, its light takes a relatively short route through the atmosphere.

But when the sun is near the horizon, its light travels through a much longer stretch of air.

That longer journey changes which colors are most likely to reach your eyes directly.

As sunlight travels through this much longer atmospheric path, the shorter blue and violet wavelengths encounter many more air molecules.

Because they scatter so easily, much of that blue light is redirected away from the original path of the sunlight.

What remains traveling more directly toward us contains proportionally more of the longer wavelengths.

These include yellow, orange, and especially red light.

That's why the setting sun can appear yellow, orange, or deep red, while the surrounding sky can take on warm colors.

The atmosphere hasn't suddenly produced red light.

The red light was already part of the sunlight.

The atmosphere simply changes how much of each color reaches our eyes.

In a way, a sunset is like a natural filter created by Earth's atmosphere.

If red light is what survives the longest atmospheric journey, why don't sunsets always look completely red?

That's because several colors can still reach our eyes depending on atmospheric conditions and the position of the sun.

Orange and yellow wavelengths are longer than blue and scatter less easily, so they can continue traveling through the atmosphere atmosphere.

This mixture can create the familiar golden and orange colors we often see before sunset.

Sometimes the sky can even become pink, purple, or magenta.

These colors can appear when different wavelengths of scattered and direct sunlight mix together,

particularly when the atmosphere contains clouds or particles that scatter light in different ways.

The exact colors depend on what is happening in the atmosphere at that particular moment.

That's one reason every sunset can look slightly different.

A sunset is a simple demonstration of how light interacts with Earth's atmosphere.

During the day, blue light scatters strongly, giving us a blue sky.

But as the sun approaches the horizon, its light travels through much more atmosphere.

More blue light is scattered away while the longer red and orange wavelengths become more visible.

Clouds, dust, and other particles can then add even more color, creating the beautiful sunsets we see.

So, why does the sky turn red at sunset?

It's because sunlight travels through much more atmosphere when the sun is near the horizon.

The blue light gets scattered away, leaving more red, orange, and yellow light for us to see.

So the next time you see a red sunset,

remember, you're watching sunlight interact with Earth's atmosphere in a beautiful everyday display of science.

experience.

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本課的詞彙與口語要點

這段影片共有 67 個句子、937 個單詞可供跟讀。講話部分時長為 7:45。說話人語速平穩，每分鐘約 121 個詞，很適合跟讀。只有 78% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。

影片中的重點詞彙

影片中 15 個不太常見的單詞，附發音和釋義：

atmosphere /ˈætməsˌfɪɹ/ (名詞) — 大氣 /大氣, 氣圈 /氣圈. The gases surrounding the Earth or any astronomical body.
sunlight /ˈsʌnˌlaɪt/ (名詞) — 陽光 /陽光, 日光. All the electromagnetic radiation given off by the Sun; especially, that in the visible spectrum and that bathes the Earth.
sunset /ˈsʌnˌsɛt/ (名詞) — 日落. The moment each evening when the sun disappears below the western horizon.
violet /ˈvaɪ.ə.lət/ (名詞) — 紫羅蘭 /紫羅蘭, 堇菜. A plant or flower of the genus Viola, especially the fragrant Viola odorata; (inexact) similar-looking plants and flowers.
horizon /həˈɹaɪ.zən/ (名詞) — 地平線 /地平線, 天際 /天際. The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.
cloud /ˈklaʊ̯d/ (名詞) — йүн, 雲 /雲. A visible mass of water droplets suspended in the air.
molecule /ˈmɑ.lɪ.kjul/ (名詞) — 分子. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by…
layer /ˈleɪ̯ɚ/ (名詞) — 層 /層. A single thickness of some material covering a surface.
visible /ˈvɪzɪb(ə)l/ (形容詞) — 看得見 /看得見, 可看見的 /可看見的. Able to be seen.
depend /dɪˈpɛnd/ (動詞) — 信任, 信賴 /信賴. To be contingent or conditioned; to have something as a necessary condition
mixture /ˈmɪkst͡ʃɚ/ (名詞) — 混合. The act of mixing.
interact /ɪn.təˈɹækt/ (動詞) — 互動 /互動. To engage in communication and other shared activities (with someone).
particle /ˈpɑɹtək(ə)l/ (名詞) — 粒子. A very small piece of matter, a fragment; especially, the smallest possible part of something.
absorb /æbˈsɔɹb/ (動詞) — 吸收. To include so that it no longer has separate existence; to overwhelm; to cause to disappear as if by swallowing up; to incorporate; to assimilate; to take in…
everyday /ˈɛvɹiˌdeɪ/ (形容詞) — 日常的. Appropriate for ordinary use, rather than for special occasions.

需要注意的發音

說話人用了 7 次縮略和弱讀形式，例如 you're, don't, hasn't。請按聽到的簡短形式來說。

“sh” 和 “zh” 音: shine /ʃaɪn/, demonstration /dɛmənˈstɹeɪʃən/, flashlight /ˈflæʃˌlaɪt/, proportionally /pɹəˈpɔɹʃənəli/
長單詞——注意重音位置: atmospheric /ˌætməsˈfɛɹɪk/, differently /ˈdɪf.ə.ɹənt.li/, surprisingly /səˈpɹaɪzɪŋli/, demonstration /dɛmənˈstɹeɪʃən/, proportionally /pɹəˈpɔɹʃənəli/

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。
用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
錄下自己的聲音並與原聲對比，特別注意 atmosphere, sunlight, sunset 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 created · is actually made · is scattered
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	Have you ever looked · has been scattered

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 Does the Sky Turn Red at Sunset? - 通過影片學習英語口語

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