是故君子自难而易彼,众人自易而难彼。
所以君子严于律己.宽以待人,而平庸的人却宽以待己.严于律人。
我们不是从祖先那里继承了海洋,而是从子孙那里借来的。
The past is a fire that never stops burning.
A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.