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.
La literatura es el espejo de la sociedad, reflejando sus virtudes y sus defectos.
诗歌必须始终具有道德目的;它应该在愉悦的同时教导。
The rule of law requires that laws be general, public, prospective, clear, and consistent.
我们都是等待被发掘的潜在化石。
Writing is not about communicating, it's about thinking.