You may exchange the shoes but not return them for a refund.

"你可调换这双鞋,但不能退货。"

This worker wants a transfer to another post.

这个人要求调换。

Changing her job like that is equivalent to giving her the sack.

样调换她的作等于是解雇她。

I got it on seventeen days approval,so if you don’t like it we can change it.

我买这件东西可试用17,所以你要是不喜欢我们可以拿去调换。

If the equipment is not up to the agreed specifications and quality, we will undertake to replace them.

如果设备达不的规格质量, 我们将负责调换。