埃塞俄比亚人说他们的神是塌鼻子和黑色的，色雷斯人说他们的神有浅蓝色的眼睛和红色的头发。

可持续性不是一种趋势；这是我们对后代的责任。

I look back on the past, committed a felony little fool, I want to communicate with him and let him understand, but I can't do this, the boy would not see the, only my old trunk.

It may be unfair, but what happens in a single day can change the course of a whole lifetime.

To be a good mathematician, you need to have both intuition and rigor.