Natural experiments can provide valuable insights into economic questions.
自然实验可以为经济问题提供有价值的见解。
独裁统治滋生糟糕的文学,因为它们滋生恐惧和顺从。
也许我们能期望的最好结果,就是带着正确的遗憾结束。
The rules of morality are not the conclusion of our reason.