—— 请按键盘 空白键 开始游戏 ——

数学不是一项观赏性运动。
Mathematics is not a spectator sport.
记忆是个狡猾的东西;它既可以是安慰,也可以是诅咒。
The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.
书是一扇门,你打开它,然后走进去。