When life seems hard, the courageous do not lie down and accept defeat; instead, they are all the more determined to struggle for better future.

做数学就是同时参与创造和发现的行为。

根据问题出现的背景，代数实部可以接受从负无穷到正无穷的所有数值。

容易得到的东西，是靠不住的；轻易许下的诺言，不值得信赖。

我不是人类，我是怪物。

We are not selling water, we are selling health and quality of life.

语言是永远不会放逐你的家园。