"The journey of a thousand miles begins with a single step."

I have always preferred working on concrete problems rather than abstract theories.

怎么会有不用同道的人而只用与自己意见相同的人的道理呢？ 

我一直说一切皆有可能。

The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.

可持续性不是选择，而是我们对后代的责任。