—— 请按键盘 空白键 开始游戏 ——

当你怀疑自己能否飞翔的那一刻,你就永远失去了飞翔的能力。
The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.
The beauty of a mathematical proof is in its elegance and the way it reveals the underlying truth in a clear and concise manner.