—— 请按键盘 空白键 开始游戏 ——

每个家庭都是一个团结的小社会,自由和相互之间的感情是他们唯一的纽带。
The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
真相很少是纯粹的,也从来不是简单的。