—— 请按键盘 空白键 开始游戏 ——

Everything can be taken from a man but one thing: the last of the human freedoms—to choose one's attitude in any given set of circumstances.
一切都可以从一个人身上夺走,除了一样:人类最后的自由——在任何特定环境下选择自己态度的能力。
The pursuit of mathematical knowledge is a journey that never ends.