go on a fishing expedition

• v. 试探一下

go on a fishing expedition的用法和样例：

例句

用作动词 (v.)

1. I went to feel the old man's pulse on the subject.
   我去试探一下老人对这个问题的看法。
2. I expect he's just trying it on because I am new.
   我估计他只要试探一下而已，因为我要新来的。