以下为句子列表：
英文: A study published in January in The Journal of the American College of Cardiology, for example, suggests that the amount of caffeine in two cu of coffee significantly decreases blood flow to the heart, particularly during exercise at high altitude.
中文: 比如说，刊登在1月份美国心脏病学会志上的一项研究结果认为，两杯咖啡中含有的咖啡因可以显著的减少流向心脏的血液，特别是在高纬度地区锻炼时。
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英文: A study published in January in The Journal of the American College of Cardiology, for example, suggests that the amount of caffeine in two cups of coffee significantly decreases blood flow to the heart, particularly during exercise at high altitude.
中文: 比如说，刊登在1月份美国心脏病学会志上的一项研究结果认为，两杯咖啡中含有的咖啡因可以显著的减少流向心脏的血液，特别是在高纬度地区锻炼时。
更详细...
英文: After years of controversy over the issue, most researchers now believe that, although caffeine does cross the placenta, moderate amounts (less than 300 milligrams a day) won't harm your baby.
中文: 经过几年的争论后，现在多数研究人员认为：虽然咖啡因可以透过胎盘，但是适量的咖啡因（每天的摄入不超过300毫克）不会给胎儿带来伤害。
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英文: An addictive drug that 90% of Americans consume every day, caffeine prevents us from getting our ZZZZs by increasing nerve activity in our bodies-keeping us alert and hyperactive.
中文: 咖啡可以让人保持清醒，达到一个兴奋状态，这都要归结于它内含的咖啡因。那么咖啡因是如何作用我们的神经，让我们保持兴奋的呢？
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英文: And according to the March of Dimes, high caffeine consumption may slightly increase the risk of preterm labor or low birth weight, which could make a difference for a baby who's already at risk for these problems.
中文: 根据出生缺陷基金会的报告，摄入过量的咖啡因会略微增加早产或低出生体重儿的风险，这对已存在这些风险的胎儿尤为重要。
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