Pick up这个搭配我们都很熟悉，它有“拿起，捡起，开车接某人”等等意思，用途也很广。作这些意思时，通常后接某物，今天我们要讲这个搭配的另一个常见意思。

to criticize someone about something they have said

在…上挑(某人)毛病，指出(某人)在…方面的错误

I want to pick you up on the point you made a few minutes ago about personal morality.

我对您刚才有关个人道德的观点有不同的意见。

His teacher picked him up on his pronunciation.

他的老师指出了他的发音错误。