人类心智形成和操纵符号的能力使我们区别于其他动物。

模形式的算术是理解高维对象的门户。

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.

There is more to feminine charm than just measurements. I don’t need a bedroom to prove my womanliness. I can convey just as much femininity, picking apples off a tree or standing in the rain.

挑战是考验我们韧性的烤箱，我们如何应对它们决定了我们的成功。