in and out
进进出出； 曲曲弯弯； 一来一往
该短语在句中一般充当状语.
如：
The boy chased his sister in and out among the bushes.
那个男孩在灌木丛里跟着他姐姐追过来追过去.
Lying as it does in the deep waters of the Western Pacific, Japan winds in and out like a snake from southwest to northeast, a distance of more than two thousand miles.
日本这个国家位于西太平洋的深水地带, 像蛇一样弯弯曲曲地自西南向东北延伸, 全长两千多英里.
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