世界不是一个满足愿望的工厂。
The world is not a wish-granting factory.
当我接近一个孩子时,他激发了我两种情感:对他现在的温柔和对他未来可能成为的尊重。
Ideas are like fish. If you want to catch little fish, you can stay in the shallow water. But if you want to catch the big fish, you've got to go deeper.
理论的任务不仅是了解自然是什么以及它是如何运作的,而且要尽可能接近理解为什么自然是这样的而不是其他样子的不可达到的目标。
Natural experiments can provide valuable insights into economic questions.