For example, U. S. researchers reported last Monday that pregnant women who drink two or more cups of coffee a day have twice the risk of a miscarriage as those who avoid caffeine.
比如，美国研究者上周一报道孕妇一天喝2或多杯咖啡，其流产风险是不使用咖啡因的2倍。
For example, U. S. researchers reported last Monday that pregnant women who drink two or more cups of coffee a day have twice the risk of a miscarriage as those who avoid caffeine.
比如，美国研究者上周一报道孕妇一天喝2或多杯咖啡，其流产风险是不使用咖啡因的2倍。
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