Sometimes you have to play a long time to be able to play like yourself.
闹市是赚钱的地方,安静的地方才能休养身体。
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.
拥有自由、书、花和月亮,哪个人会不快乐?