科学为什么·英语30篇（1）

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为什么彩虹总出现在太阳对面？

Rainbows form when sunlight enters raindrops, bends, reflects once inside, and exits at a specific angle.
This bending—called refraction—separates white light into its rainbow colors like a prism does.
Because the light must reflect at about 42 degrees from the original sunbeam, you only see the arc opposite the sun.
If you face away from the sun with rain in front of you, the geometry aligns perfectly for a rainbow to appear.
No two people see the exact same rainbow, since each observer’s position changes the raindrops involved.
The center of the rainbow’s circle is always the shadow of your head—the antisolar point—making it personal and fleeting.
Double rainbows occur when light reflects twice inside the drop, reversing color order and appearing fainter.
You’ll never find the rainbow’s end because it’s not a physical object—it’s an optical pattern shaped by light and perspective.

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This bending—called refraction—separates white light into its rainbow colors like a prism does. 这种弯曲现象称为折射，它将白光分解为彩虹的各色光，原理如同棱镜。
Rainbows form when sunlight enters raindrops, bends, reflects once inside, and exits at a specific angle. 彩虹形成于阳光射入雨滴后发生折射、在内部反射一次，再以特定角度射出的过程。
No two people see the exact same rainbow, since each observer’s position changes the raindrops involved. 没有两个人能看到完全相同的彩虹，因为每位观察者的位置不同，所涉及的雨滴也不同。

这篇中文题目最接近哪一句？为什么彩虹总出现在太阳对面？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？彩虹形成于阳光射入雨滴后发生折射、在内部反射一次，再以特定角度射出的过程。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 Do Rainbows Always Appear Opposite the Sun? How to cook noodles A maths worksheet

This bending—called refraction—separates white light into its rainbow colors like a prism does.

This bending—called refraction—separates white light into its rainbow colors like a prism does.

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：This bending—called refraction—separates white light into its rainbow colors like a prism does.