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.

This is an interesting planet. It deserves all the attention you can give it.

建筑是一种象征，建造行为也是。建筑是人类创造的最沉重、最永久的事物之一，它们是通过巨大的努力和牺牲而建成的。

The best way to predict the future is to invent it.