Money is not the only answer, but it makes a difference.

The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

压力是一种特权。

高分子化学的引入开辟了一个新的材料世界，其重要性可与发现新大陆相媲美。