—— 请按键盘 空白键 开始游戏 ——

The truth is rarely pure and never simple.
When people are faced with a problem, they often think in terms of past experiences rather than looking at the actual structure of the problem.
最成功的现代国家是那些能够利用市场力量,同时保持一个能够提供公共产品和规范私人活动的强大国家的国家。
可持续性不是一种选择,而是我们对后代的责任。