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 best way to be successful is to never give up.
过度捕捞只会让海洋变成荒漠，我们必须学会节制。
The process of doing mathematics is as important as the result itself.
成功的关键在于理解并满足他人的需求。