数学是给不同事物起相同名字的艺术。
When you do something best in the world, you can’t really improve on that.
The truth is, we are all capable of turning our backs on the truth.
"The world is not a problem to be solved but a mystery to be lived."
我不数做了多少仰卧起坐,只在感到疼痛时才开始计数。