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1·When the contradictions such as the centripetal force of consanguinity, the disunite of the property, the scope and necessity of family were violent, the big family was threatened.

当血缘关系的向心力与财产经济的离心力矛盾、家庭规模与供养需要矛盾剧烈时，大家庭存在即受威胁。