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

It's a comedy that you only get once you performed and once you know what's happening, and

这种喜剧只有你自己明白，只有你自己知道发生了什么，

街头表演很有趣 - SpeakingMax英语口语达人