—— 请按键盘 空白键 开始游戏 ——

The most dangerous creation of any society is the man who has nothing to lose.
只有当人认识到自己对别人的依赖时,他才是真正自由的。
可持续性不是潮流,而是我们行业生存的必需。
The beauty of instrumental variables is that they allow us to see the world in a new light.