—— 请按键盘 空白键 开始游戏 ——

Nothing is so fatiguing as the eternal hanging on of an uncompleted task.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
History is not just about the past, it is also a mirror of the present.
数学不仅仅是一种工具;它是一种思维方式。