你好，
给你一世界的分布图
来源于下：
Description
English: Geographical areas associated with groundwater fluoride concentrations above 1.5 mg/L. Derived from data in Figure 2 in: Error: title= and url= must be specifiedNational Health and Medical Research Council (Australia) (2007). (PDF). Retrieved on 2009-02-24.
Date 22 May 2009
Source own work, derived from File:BlankMap-World6, compact.svg, along with data from the sourced mentioned above.
Author User:Eubulides
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