Do you see clouds in the sky? 你看到天上的乌云了吗？

　　You can see rain soon. 不久你就能看到雨了。

　　If it rains too much,a flood could happen. 如果雨下得太大，会发洪水。

　　How big is rain? 雨滴有多大？

　　One raindrop is smaller than a centimeter across. 一颗雨滴直径小于1厘米。

　　It is about from 1/100th of an inch to 1/4th of an inch. 大约在1/100英寸到1/4英寸之间。

　　It falls from the sky at between 7 and 18 miles per hour.  雨以每小时7到18米的速度从天空降落。