人类是一种糟糕的动物。
The debate isn't 'coal vs. renewables'—it's how to integrate both during the transition.
The best way to predict the future is to create it.
父亲过于慈爱，不忍心鞭策子女，那么家里就容易出现品德败坏的子女。
Natural experiments are a powerful tool for understanding causal relationships in the real world.
