——杜先生晚年在香港，先生为中国抗战.赈灾慈善做出巨大贡献，晚年依旧气度过人，毁掉所有欠条。
The unexamined life is not worth living.
The idea of inflation is that the universe underwent a period of extremely rapid expansion in its earliest moments.
知道什么都不是；想象才是一切。
Labor economics is fundamentally about understanding people’s choices and constraints.