—— 请按键盘 空白键 开始游戏 ——

Mathematics is the art of giving the same name to different things.
It is a common experience that a problem difficult at night is resolved in the morning after the committee of sleep has worked on it.
可持续农业不是一种趋势,而是我们星球唯一的前进道路。
The desire for recognition is a fundamental human need.