—— 请按键盘 空白键 开始游戏 ——

预测未来的最好方法就是创造未来。
Happiness is not something that happens. It is not the result of good fortune or random chance. It is not something that money can buy or power command. It depends not on what happens outside of you, but on what happens inside of you.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.