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.
Sustainability isn't just a buzzword; it's a responsibility we owe to future generations.
每个句子末端都等待着一个真相。
表演不是要成为不同的人。它是在明显不同的事物中找到相似之处，然后在那里找到自己。
To understand the electron is to understand the foundation of our technological civilization.
过去越黑暗，未来越光明。