A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.
钓鱼的人躬着身子,不是要对鱼恭恭敬敬;用虫子作为诱饵捕鼠,也不是因为喜爱老鼠。
在古典音乐中,传统既是我们最宝贵的资产,也是最沉重的负担。
Difficult circumstances serve as a textbook of life for people.
电影永远不会完成,只会被放弃。