一个问题如果在计算机上可以快速解决，那么它属于P类问题；如果一个解可以快速验证，那么它属于NP类问题。
I am not interested in what is called success. I am interested in the process of achieving it.
The real problem is not whether machines think but whether men do.
The world is full of poetry. The air is living with its spirit; and the waves dance to the music of its melodies, and sparkle in its brightness.
最高尚的快乐是理解的喜悦。
Collaboration across sectors is the only way to solve forestry's greatest challenges.