—— 请按键盘 空白键 开始游戏 ——

数学中的每个问题都是一个等待解决的谜题,而乐趣就在于解决的过程。
我正充实地生活着,不会浪费任何时间。
In the act of writing, we confront our deepest fears and desires.
Collaboration across industries and borders is essential to meet the world's energy needs.