The pain you feel today will be the strength you feel tomorrow.

美国是唯一一个直接从野蛮进入颓废、中间没有经过文明阶段的社会。

Every mark on the canvas is a memory.

Never underestimate the power of small, consistent improvements—they lead to big results over time.

NP完全性的概念为理解问题的复杂性提供了一个强大的工具。

Stray birds of summer come to my window to sing and fly away。 And yellow leaves of autumn， which have no songs， flutter and fall there with a sigh。

成功的关键在于坚持和努力。