以下为句子列表：
英文: The incidence of children suffering from mottled teeth of children aged 8 to years was 9.0%、 .0% and . 7%,respectively;
中文: 8~岁儿童氟斑牙患病率分别为 9.0%、 .0%和 . 7%;
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英文: The incidence of children suffering from mottled teeth was .0% and .0%.
中文: 个监测点8~岁儿童氟斑牙患病率分别为 .0%和.0%,平均为 7.9 %。
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