小于给定数的素数个数是该数的一个函数。

"The greatest stories are those that leave wounds."

Matter is divisible ad infinitum, while form is indivisible.

Literature is a fire that burns in the soul, illuminating the darkest corners of our existence.

努力成就了你。如果现在不全力以赴，总有一天会后悔。不要觉得为时已晚，继续努力吧。