One study, published last year, found a small but significant effect on average in children born to women who consumed just a drink and a half a week.
去年发表的一项研究指出，平均一周喝一罐半啤酒的孕妇所生的胎儿会受到很小但是很明显的影响。
Volunteers are given tiny traces of a radioactively labelled drug-too small to harm them, and typically just one-hundredth of the estimated full dose-in a drink.
志愿者饮用了微量的放射性元素标记的药物——剂量小到没有伤害，只有足量的百分之一。
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