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

如果一个人以他的财富为骄傲，那么要看他如何运用财富，才知道他是否应该被称赞。

There are two kinds of companies， those that work to try to charge more and those that work to charge less. We will be the second.

对于每一位专家，都会有一个同等的或者完全相反的专家。但对于每一个事实，并不一定就有一个同等的或者相反的事实存在。