十万个为什么·科学启蒙30篇（1）

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天空为什么是蓝色的？

Sunlight looks white, but it actually contains all colors of the rainbow mixed together.
When sunlight enters Earth’s atmosphere, tiny air molecules scatter the light in all directions.
Blue light has shorter wavelengths and scatters much more easily than red or yellow light.
This strong scattering makes blue light reach our eyes from many different angles across the sky.
At sunrise or sunset, sunlight travels through more atmosphere, so most blue light is scattered away.
The remaining light that reaches us directly is richer in red and orange wavelengths instead.
That’s why the sky near the sun appears golden or fiery during those times.
Without an atmosphere—like on the Moon—the sky would always look black, even at noon.
Scientists use this same scattering principle to study the composition of distant planetary atmospheres.
You can even see a hint of this effect by shining a flashlight through a glass of water with a drop of milk.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Sunlight looks white, but it actually contains all colors of the rainbow mixed together. 阳光看似白色，实则混合了彩虹中的所有颜色。
When sunlight enters Earth’s atmosphere, tiny air molecules scatter the light in all directions. 当阳光进入地球大气层时，微小的空气分子会将光线向四面八方散射。
That’s why the sky near the sun appears golden or fiery during those times. 因此，此时太阳附近的天空呈现金色或火红色。

这篇中文题目最接近哪一句？天空为什么是蓝色的？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？阳光看似白色，实则混合了彩虹中的所有颜色。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Is the Sky Blue? How to cook noodles A maths worksheet

Sunlight looks white, but it actually contains all colors of the rainbow mixed together.

Sunlight looks white, but it actually contains all colors of the rainbow mixed together.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Sunlight looks white, but it actually contains all colors of the rainbow mixed together.