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丹麦和日本的科学家经研究发现,如果夫妇在准备生孩子期间吸烟的话,生男孩的比例就可能会降低。科学家们对5372名年龄在20-49岁间的女性进行了调查,
Researchers in Denmark and Japan have found that if the couple smokes while preparing to have children, the proportion of boys may be reduced. Scientists surveyed 5,372 women aged 20-49,