back and forth 来来回回;反复

例句：

He walked back and forth in the room, thinking about the problem.

他在屋里来回走动，思考着问题。

Don't say this back and forth, I know how to do.

不要反复说这个，我知道该怎么做。

A:Please don't go back and forth, I'm doing my homework.

请不要来回走动，我在写作业。

B:Oh, I'm sorry, I didn't notice that you were doing your homework.

哦，对不起，我没注意到你在写作业。

背景音乐：

Before You Break My Heart — Stevie Hoang