世界可能很刻薄,但人们不必如此。
The world might be mean, but people don't have to be.
我从不认为任何事情是理所当然的。
Randomized evaluations can help us understand what works and what doesn't in development.
这些高墙还真是有点意思。一开始你恨它,然后你对它就习惯了。等相当的时间过去后,你还会依赖它。