After entering the society of civilization, the relations of the male and female have evolved from crossbred of mating group to the monogamy.
进入文明社会以后，人类两性关系从群婚杂交演变为一夫一妻制。
After entering the society of civilization, the relations of the male and female have evolved from crossbred of mating group to the monogamy.
进入文明社会以后，人类两性关系从群婚杂交演变为一夫一妻制。
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