每个故事都有开始、中间和结尾，但不一定是这个顺序。

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.

每一本书都是作者与读者之间的一场对话。

我对中间空间感兴趣，事物在那里汇聚的地方。