一个作家是一个对现实世界不满意的人，他想要改变它，改善它，让它变得更美丽，更公正，更宜居。
The concept of law is essentially a matter of social fact.
The most successful leaders are those who are humble enough to know they don’t have all the answers.
The future belongs to those who can balance energy needs with environmental responsibility.
Never underestimate the power of hard work and perseverance.
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."