幸福不在于拥有什么，而在于享受什么。

Every chemical process we develop must pass three tests: Is it safe? Is it sustainable? Is it scalable?

In the past the man has been first; in the future the system must be first.

A statement is a means to convey information， a promise is a means to make a commitment.

数学是关于概念之间关系的科学，与这些概念的内容无关。