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阳光遇到雨滴时，彩虹是怎样形成的？

Rainbows appear when sunlight enters spherical raindrops, bends, reflects inside, and exits.
White light separates into colors because each wavelength bends by a slightly different amount.
Red light bends least and exits at about 42 degrees; violet bends most and exits near 40 degrees.
Your eye sees only one color from each drop, depending on its position in the sky.
Millions of drops together create the full arc, with red always on the outer edge.
You must stand with your back to the sun and rain in front to see a rainbow clearly.
Double rainbows occur when light reflects twice inside a drop, reversing color order.
The secondary bow is fainter because more light escapes after the second bounce.
No two people ever see the exact same rainbow, since it depends on their unique viewpoint.
This natural prism effect reveals how light and water interact to produce beauty and science.

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

Rainbows appear when sunlight enters spherical raindrops, bends, reflects inside, and exits. 彩虹出现时，阳光进入球形雨滴，发生折射、内部反射，再折射而出。
Double rainbows occur when light reflects twice inside a drop, reversing color order. 双彩虹由光线在雨滴内反射两次形成，颜色顺序相反。
The secondary bow is fainter because more light escapes after the second bounce. 副虹较暗，因为第二次反射后更多光线逸出。

这篇中文题目最接近哪一句？阳光遇到雨滴时，彩虹是怎样形成的？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？彩虹出现时，阳光进入球形雨滴，发生折射、内部反射，再折射而出。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） How Do Rainbows Form When Sunlight Meets Raindrops? How to cook noodles A maths worksheet

Rainbows appear when sunlight enters spherical raindrops, bends, reflects inside, and exits.

Rainbows appear when sunlight enters spherical raindrops, bends, reflects inside, and exits.

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：Rainbows appear when sunlight enters spherical raindrops, bends, reflects inside, and exits.