农民是我们经济中唯一以零售价购买一切、以批发价出售一切，并双向支付运费的人。

Development economics is ultimately about improving people's lives.

"The unsaid, for me, exerts great power."

The best leaders are those most interested in surrounding themselves with assistants and associates smarter than they are.

实现明天的唯一限制是我们今天的疑虑。