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"The world is full of signs and wonders, but we walk past them every day without seeing."
什么都会的人,很少有自己所真正精通的东西,整天沉心思虑的人,往往遇事难以下决断。
"A literatura é a expressão máxima da liberdade humana."
Natural experiments are a powerful tool for understanding causal relationships in the real world.