没有人规定你必须永远快乐。

有时候，最难的事情和正确的事情是同一件事。

The essence of creativity is figuring out how to use what you already know in order to go beyond what you already think.

在沉默中，我们听到最真实的声音。

衡量一个文明的标准是它如何对待其最弱的成员。

天然气将发挥关键的桥梁作用，但它不能是最终目的地。

真正的科学进步需要创造力和纪律性。

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.