Randomized evaluations can help us understand what works and what doesn't in development.
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。
"Books are the mirrors of the soul."
"The human figure is the most challenging and rewarding subject for an artist."
乐观是正常的,但一些幸运的人比我们其他人更乐观。