每个国家都是它讲述给自己的故事。
The most important thing in science is not to solve problems, but to ask the right questions.
当我走出囚室、迈过通往自由的监狱大门时,我已经清楚,自己若不能把悲痛与怨恨留在身后,那么我其实仍在狱中。
"Matching methods can be a powerful tool when randomization is not possible."