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.