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。

The P versus NP problem is one of the most important problems in computer science.

建筑是一种梦想，是对未来的梦想。

If we had a keen vision and feeling of all ordinary human life, it would be like hearing the grass grow and the squirrel's heart beat, and we should die of that roar which lies on the other side of silence.

质量不仅仅是一个目标，它是一个旅程。