—— 请按键盘 空白键 开始游戏 ——

一个人不论年龄多大,都要学习自己不懂的东西。这不是羞耻。
The process of mathematical discovery is as important as the discovery itself.
It is a common experience that a problem difficult at night is resolved in the morning after the committee of sleep has worked on it.
The greatest virtue in life is real courage that knows how to face facts and live beyond them.