—— 请按键盘 空白键 开始游戏 ——

The game of life is the game of everlasting learning. At least it is if you want to win.
The best way to predict the future is to invent it.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
忙碌的人没有时间流泪
——〈在北京基督教等六教会欢迎会的演说〉,1912年9月5日