—— 请按键盘 空白键 开始游戏 ——

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
不要问国家可以为你做什么,你应该要问自己可以为国家做什么。
The individual's biography is shaped by the historical and social context in which it is embedded.