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."
The farmer is the cornerstone of our civilization.
The more you sweat in peace, the less you bleed in war.
Love is not about finding the perfect person, but about seeing the imperfect person perfectly.
The human body is first and foremost a mirror to the soul and the greatest achievement in art is to make that mirror reflect the truth.