1.The sound of gentle rain against windows or medium rain against rooftop with overspill from gutters.

雨打到窗户上的音或者是中雨打在屋顶上，雨水从沟槽里流下。

2.Medium rainfall on roof with gentle overspill from gutters...It's your favorite, isn't it?

中雨打在屋顶上，雨水从沟槽里流出，这不是你最喜欢的？

3.Medium rainfall on roof with gentle overspill from gutters...

中雨打在屋顶上 雨水从沟槽里流出。

4.Some flooding from that overspill results—but not as much as if the spill were allowed to erode and destroy the levee itself.

这样虽然有一些河水漫出堤坝，但成的损失会远远小于由于土坝在水流侵蚀下而垮塌产生的后果。