经济学中最重要的是理解个人和企业的行为。

解释：辅与车互相依存，嘴唇没有了，牙齿就要受寒。

A public-opinion poll is no substitute for thought.

Every loaf tells a story—of the baker's skill, the flour's origin, and the care taken at every step.

The environment is a long-term issue that requires long-term commitment.

我不是淑女，我是Gaga。