🗣️ 情景例句
Rotten weather, isn't it?
天气糟透了， 不是吗？
It wasn't any bother.I was glad to do it.
不麻烦.我乐意做。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）