🗣️ 情景例句
Los Angeles? That's a big decision. Los Angeles
这可是个大决定。
Will you stay there for long?
你会在那儿待很长时间吗？
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）