—— 请按键盘 空白键 开始游戏 ——

The beauty of a mathematical proof is in its elegance and the way it reveals the underlying truth in a clear and concise manner.
主要的义务规则是那些要求或禁止某些行为的规则。
Assume the feeling of your wish fulfilled, and it will be attracted to you.
The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome.