—— 请按键盘 空白键 开始游戏 ——

数学不仅仅是一种工具;它是一种思维方式。
Those who cannot remember the past arecondemned to repeatit.
Why do I stand up here? I stand upon my desk...to remind myself that we must constantly look at things in a different way.
 On the path to truth, only the brave can persist to the end.
我的父亲是我最好的朋友和最伟大的榜样。他是一个了不起的父亲、教练、导师、军人、丈夫和朋友。