小于给定数的素数个数是该数的一个函数。
荒野不在乎你的过去。它只在乎你此刻的行动。
"The comeback is always stronger than the setback."
保持饥饿，保持愚蠢。
【释义】即使马鞭很长，也打不到马的肚子。
The journey of solving a mathematical problem is as important as the solution itself, for it teaches us patience, persistence, and the joy of discovery.