以下为句子列表：
英文: Fluorosis is more common than arsenic poisoning because high-fluorine coal is combined with high-fluorine clay to make briquettes.
中文: 氟中毒的病例比砷中毒更常见，因为含氟量高的煤与含氟量高的黏土混合，再制成煤饼、煤砖。
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英文: Methods: 24 patients whose teeth exhibiting severe dental fluorosis and who need orthodontics were chosen, and there were all 444 teeth that orthodontic brackets should be bonded to.
中文: 方法选取24例重度氟斑牙需要进行正畸的患者，共444颗需要粘结托槽的牙齿。
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英文: Methods: The scanning electron microscopy (SEM) observations were made on 10 fluorosed teeth extracted from people of 30-40 years old for periodontitis reason from Tanggu area, Tianjing Province (water-drinking endemic fluorosis area), and from Xianfeng c
中文: 方法：从燃煤污染型氟中毒病区湖北省恩施州咸丰县和饮水型氟中毒病区天津市塘沽区分别收集30-40岁因牙周炎拔除的氟斑牙，各选10颗，对照牙为我院外科门诊拔除的12颗完好正畸牙。
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英文: Objective: To describe and compare the structure characteristics of enamel in human severely fluorotic teeth from water-drinking endemic fluorosis area and coal-burning endemic fluorosis area.
中文: 摘要目的：描述并比较燃煤污染型和饮水型氟中毒地区重度氟斑牙釉质结构特点。
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英文: The findings showed that there was a dose-response relationship between the prevalence rate of osteofluorosis and fluoride content of indoor air, time of burning coal and so on.
中文: 果说明,氟骨症患病率与室内空气氟、烧煤时间等存在着剂量——效应关系。
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