以下为句子列表：
英文: A “BEATING HEART,” or “off pump,” coronary-artery bypass may seem, as one surgeon puts it, “like cutting a gemstone on horseback,” but new instruments can steady the steed while the rider works [see box on opposite page].
中文: 进行「跳动式」或「无帮浦」的冠状动脉绕道手术，就像一位外科医师所说的，「像是骑在马背上切割宝石」，不过已经有新的仪器可以稳住马匹，让马背上的骑士执行工作（详见95页〈外科医师的助手〉）。
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英文: The mean coronary-artery calcium score was significantly lower with estrogen than with placebo.
中文: 服用雌激素者的平均冠状动脉钙化评分比服用安慰剂者显著性降低。
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英文: We examined the relationship between estrogen therapy and coronary-artery calcium in the context of a randomized clinical trial.
中文: 我们通过随机临床实验研究雌激素治疗和冠状动脉钙化之间的关系。
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