随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。
Randomized evaluations can help us understand what works and what doesn't in development.
Tradition and innovation are not opposites—they're partners in progress.
真理不需要华丽的装饰。
If a program manipulates a large amount of data, it does so in a small number of ways.
合作是关键，没有一家伟大的企业是独自成功的。