最优财政政策要求税收随时间平滑，因为突然的变化会扭曲经济决策。

The strength of a building is not just in its materials, but in the spirit of the people who use it.

The only way to find out anything about what kinds of books people would like to read is to publish books and see what happens.

一行好诗应该让你惊讶两次：当你写下它时和当你读到它时。