我经历了很多，但我依然屹立不倒。
The world is a book, and those who do not travel read only one page.
"Causal inference requires careful thought about the assumptions underlying your analysis."
一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。
The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.
