—— 请按键盘 空白键 开始游戏 ——

When you are young, you think you will be happy when you are older. But then you get older and you realize you were happy when you were young.
一个人最危险的敌人是他自己的口舌。
The most profound ideas in mathematics often come from asking the simplest questions.
最好的科学是双手弄脏而头脑清醒时完成的。