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。
数学不仅仅是数字和方程;它是关于理解宇宙中的深层模式和联系。
"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。