聪明人的快乐是我所知最罕见的东西。
Happiness in intelligent people is the rarest thing I know.
数学的美在于它能够以最优雅的方式描述宇宙。
除非你先是一个读者,否则你不可能成为一个作家。
As Will Rogers would have said, "There is no such thing as a free variable."