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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.
Technology should ultimately serve people, not the other way around.
我相信诗歌是一种表达无法表达之物的方式。
The choice for mankind lies between freedom and happiness and for the great bulk of mankind, happiness is better.