Your love is so addictive.

你不是通过遵循规则学会走路的。你是通过实践和跌倒学会的。

Success is not final, failure is not fatal: It is the courage to continue that counts.

Natural experiments are a powerful tool for understanding causal relationships in the real world.

不要害怕挑战，因为挑战让你成长。

言论自由是自由的重要堡垒；它们共同繁荣和共同消亡。