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，主要来土母质。

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.

要地氟夏广泛分布的一种地方，与夏特殊的原生地球化学环境有密切关系。