脱口说英语口语生活习语大全T-18：to and fro 来来回回

A:你为什么一直在房间里来回地走啊?

B:I'm worrying about the children. After all this is the first time they're been out without us.

B：我为孩子们担心，毕竟他们是第一次离开我们，走出家门。

A:Don't worry. They are grown-ups.

A：别担心，他们已经长大了。

B:I know. But I couldn't help.

B:我知道，但还是情不自禁。