—— 请按键盘 空白键 开始游戏 ——

Opportunity lies in the place where the complaints are.
朗兰兹对应不仅仅是一个定理,而是未来发现的指导原则。
"Science is the poetry of reality."
In international trade, a country should specialize in the production of goods for which it has a comparative advantage, and trade with other nations to maximize overall economic welfare.