You can't change the past, but you can ruin the present by worrying about the future.

我相信建筑是一种可以影响人们生活和思维方式的艺术形式。

证明P=NP将对数学、密码学和算法设计产生深远的影响。

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.