以下为句子列表：
英文: In medieval China, it was not unusual for a mother to breast-feed a child until the child was seven years old.
中文: 在旧中国，母亲给七岁大的孩子母乳喂奶并不希奇。
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英文: Mothers who breast-feed their children may help to protect them from developing celiac disease, an intolerance to a protein found in wheat, rye and barley, scientists said on Tuesday.
中文: 英国医学家11月15日表示，母乳喂养将使婴儿不易患上麸质过敏症。麸质过敏症是指对小麦、黑麦和大麦中含有的一种蛋白质的过敏反应。
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英文: NEW YORK (Reuters Health), Jan 22 - Women who breast-feed may need to be careful about getting enough calcium to keep their teeth and gums healthy, new animal research suggests.
中文: 纽约（路透社健康专栏）1月22日－新的动物研究表明，妇女母乳喂养期间可能需要注意补钙以保持牙齿和牙龈健康。
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英文: The percentage of U.S. mothers who breast-feed their babies has reached the highest level on record amid mounting evidence that it provides many health benefits to the child, U.S. officials said on Thursday.
中文: 据美国官员上周四介绍，美国妈妈母乳喂养的比例创空前纪录，目前已有大量证据表明母乳喂养对孩子的健康有很多好处。
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