逆向思考往往能带来意想不到的好处。
"Matching methods can be a powerful tool when randomization is not possible."
I think that the most interesting art is the art that makes you think about what you're looking at.
墨子说:言论如果能够付诸行动的就可以讲;不能够付诸行动的就别多说。言论不能付诸行动的而常讲,这就是卖弄口才了。