You're chasing down another tip.你在追踪另一条线索吗

chase down:找出

We are trying to chase down all possible clues.

我们正在设法寻找一切可能的线索。

Police in Kansas City chased down a bad guy.

堪萨斯警方追捕了一个坏家伙。

I picked her up after work today.下班后我接她回来的

pick up:接人

The driver stopped to pick up a hitchhiker.

司机停下来让一个搭车人上了车。

He stopped the car to pick up the boy.

他停下车来搭一个男孩。

常用短语:

pick up with sb.结识某人

pick up on 与 ... 熟悉起来