当随机化不可行时,匹配方法可以是一个强大的工具。
When we love, we always strive to become better than we are. When we strive to become better than we are, everything around us becomes better too.
Talent is important, but without hard work, it means nothing.
"The function of freedom is to free someone else."
城市是一个伟大的人工制品,是人类文明的最高作品。
The health of our oceans is the health of our future.