Pregnant women are warned not to smoke. It lowers the baby's birth weight. We've known for some tome that carbon monoxide in tobacco is the culprit here.
Pregnant women are warned not to smoke. It lowers the baby's birth weight. We've known for some tome that carbon monoxide in tobacco is the culprit here.
怀孕妇女被告诫不能吸烟，否则新生婴儿的体重会降低。一些书中说，烟里的一氧化碳是罪魁祸首。