Sometimes you have to play a long time to be able to play like yourself.

Every ton of coal we extract must create maximum value with minimum environmental impact.

Safety isn't a cost; it's an investment in our most valuable resource—our people.

"The only thing to do with good advice is to pass it on. It is never of any use to oneself."

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

文化是一个群体在解决外部适应和内部整合问题的过程中逐渐习得的东西。

系统不是一个生产系统，而是一个消费系统。

艺术是让我们理解真相的谎言。