小于给定数的素数个数是该数的一个函数。

技术应该服务于进步和保护。

"Illustrations are not just pictures; they are the soul of the story."

The creation of a thousand forests is in one acorn.

It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong.

There is no such joy in the tavern as upon the road thereto.

我不是榜样，我是个警示故事。