随机实验是因果推理的黄金标准，但它们并不总是可行的。
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
农业中唯一不变的就是变化——拥抱它吧。
The world is a fine place and worth the fighting for.
Don't cry to quit, cry to keep going.
数学是给不同事物起相同名字的艺术。