—— 请按键盘 空白键 开始游戏 ——

 劳动分工受市场规模的限制。
The division of labor is limited by the extent of the market.
The goal of behavior is always the reduction of some drive or need.
"The temporary is sometimes more powerful than the permanent."
第一项任务是理解问题,第二项是找到解决方案,第三项是执行它。
世界是事实的总体,而不是事物的总体。