1. The incidence of fluorosis is correlative with the content of Fluoride, which comes from mother-rock and is related to petrogenic element in soil.
   土壤F与土壤中造岩元素具显著正相关，主要来自于成土母质。
2. The endemic fluorosis is a kind of endemia widely distributed in Ningxia, and this is strongly related to the special natural geochemical environment of Ningxia.
   摘要地氟病是宁夏广泛分布的一种地方病，与宁夏特殊的原生地球化学环境有密切关系。

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