—— 请按键盘 空白键 开始游戏 ——

My mind is my weapon. My brother has his sword, King Robert has his warhammer, and I have my mind... And a mind needs books as a sword needs a whetstone, if it is to keep its edge.
"In mathematics, you don't understand things. You just get used to them."
风俗习惯是人类生活的重要指南。