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

That's the only time you're going to find out.

只有这个时候你才知道自己是否真正理解了

耶鲁公开课 - 基础物理课程节选

You're only given the particle has acceleration a, and you are asked to find out what is x?

你只知道质点的加速度为a,你需要求出x是多少

耶鲁公开课 - 基础物理课程节选