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The key to credible causal inference is not just the method, but how well the method fits the question at hand.
现代化学家不满足于仅仅成为化合物的制造者;他必须是自然的解释者。
奥林匹克运动会是四年一度的人类的春天的庆祝活动。
I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.
Nobody deserves your tears, but whoever deserves them will not make you cry.