—— 请按键盘 空白键 开始游戏 ——

我不害怕失败,我害怕不去尝试。
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
The hardest thing to learn in life is which bridge to cross and which to burn.
No society can surely be flourishing and happy, of which the far greater part of the members are poor and miserable.