But the only way you're going to find out is when you actually deal with the problem.

但是只有你动手去解题,才是验证自己会与不会的唯一方法

耶鲁公开课 - 基础物理课程节选

You could use a "who" question to find out where the problem began.

你可以用“who”问句来找出问题从哪里开始。

Who 课堂 - SpeakingMax英语口语达人