十万个为什么·科学启蒙30篇（1）

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为什么雨后会出现彩虹？

Rainbows form when sunlight passes through raindrops hanging in the air after a storm.
Each drop bends the light, separates it into colors, and reflects it back toward your eyes.
Red light bends the least, so it appears on the outer edge of the rainbow.
Violet light bends the most, which is why it always sits on the inner edge.
You must stand with your back to the sun and face the rain to see a full arc.
Double rainbows happen when light reflects twice inside a raindrop, reversing the color order.
Rainbows are actually full circles, but the ground usually blocks the lower half.
No two people see the exact same rainbow because each views light from different drops.
The size and brightness depend on drop size, sun height, and air clarity.
Photographers sometimes use mist machines to create tiny rainbows for science demos.

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

Photographers sometimes use mist machines to create tiny rainbows for science demos. 摄影师有时会用造雾机制造微小彩虹，用于科学演示。
Rainbows are actually full circles, but the ground usually blocks the lower half. 彩虹其实是完整的圆，但地面通常遮挡了下半部分。
The size and brightness depend on drop size, sun height, and air clarity. 彩虹的大小和亮度取决于雨滴大小、太阳高度及空气通透度。

这篇中文题目最接近哪一句？为什么雨后会出现彩虹？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？雨后阳光穿过空中的雨滴，便形成彩虹。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 We See Rainbows After It Rains? How to cook noodles A maths worksheet

Photographers sometimes use mist machines to create tiny rainbows for science demos.

Photographers sometimes use mist machines to create tiny rainbows for science demos.

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：Photographers sometimes use mist machines to create tiny rainbows for science demos.