Natural experiments can provide valuable insights into economic questions.
Arriving at one goal is the starting point to another.
写作就是呼吸,就是生活,就是存在于自己创造的世界中。
未来不是礼物。它是一种成就。
La vie est un sommeil, l'amour en est le rêve.
The dead are invisible, but they are not absent.