When a student failed to solve a math problem in class, he expressed his regret to his teacher. "I remember solving the problem in my dream last night, but for the time being I've forgotten it . What can that mean?"

"It means that you are more intelligent in dreams than when you are awake,"  the teacher explained.

一名学生在班上没有做出老师的教学题，他感到很遗憾，对老师解释说：“我记得昨天夜里做梦对这道题解对了，但现在一时想不起来了。这说明什么？”