keep tabs on

A mother keeps tabs on her children.

母亲照顾她的孩子们。

I’m keeping tabs on the number of private phone calls you all make from the office.

你们每个人在办公室打了多少私人电话我都记着呢。

I’m not sure about Johnson—we’d better keep tabs on him until we know we can trust him.

我对约逊不太放心——我们最好先观察他一段时间，直到我们确信可以信任他。