近亲婚姻的数量正象出生率一样急剧下降，由此排除了一大障碍。
The number of marriages between Cousins is dropping just as spectacularly as the birth rate, thereby blasting away a barrier.
近亲婚姻的数量正象出生率一样急剧下降，由此排除了一大障碍。
The number of marriages between Cousins is dropping just as spectacularly as the birth rate, thereby blasting away a barrier.
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