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在远古时期,人类对自身的躯体不甚了解。他们往往根据一些简单的现象来推测复杂的事物的真相。比如,毛发、牙齿的脱落和丧失意味着衰老
In ancient times, humans did not know much about their own bodies. They often infer the truth of complex things based on simple phenomena. For example, the loss of hair and teeth means aging