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.
有些时候这种情况可用社会来解释—在中国等国家,男孩欢迎,还未出生的女孩会被选择性
堕胎—不过自然过程也有影响。
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