—— 请按键盘 空白键 开始游戏 ——

"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
中亚的游牧民族像风一样自由,除了地平线,没有任何墙壁能束缚他们。
I’m not a one-dimensional person, and I refuse to be put in a box.
The closer you are to death, the more alive you feel. It's a wonderful way to live. It's the only way to live.