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。

Deciding what not to do is as important as deciding what to do.

Sustainability isn't an option anymore—it's a necessity for any business that wants to thrive in the 21st century.

今天的挑战就是明天的机遇——前提是我们以正确的心态面对它们。

The beauty of mathematics only shows itself to more patient followers.

Happiness writes white.

可持续性不是一种选择；它是我们共同的责任。