While some of this can be explained by society—in countries like China baby boys are favoured and many unborn girls are electively aborted—there are natural processes at work.
有候这种情况可用社会来解释—在
国等国家,男孩比较受欢迎,还未出生
女孩会被选择性
堕胎—不过自然过
也有影响。
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