keep tabs on

A mother keeps tabs on her children.

母亲照顾她的孩子。

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

你每个人在办公室打了多少私人电话着呢。

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

对约逊不太放心——好先观察他一段时间，直到确信可以信任他。