We must mine coal responsibly today so that our children inherit both energy security and a healthy environment.

The most expensive thing in the world is trust. It can take years to earn and just a matter of seconds to lose.

波点是通往无限的方式。

But I love her. She could fade and wither， how can； but I just look at her， all the tenderness， Chung on the heart.

λ演算是一种表示函数及其应用的形式体系。