Fluoride occurs at elevated concentrations in many areas of the world including Africa, the Eastern Mediterranean and southern Asia.
在世界许多地区，包括非洲、东地中海和南亚，氟化物浓度都有升高趋势。
Fluoride occurs at elevated concentrations in many areas of the world including Africa, the Eastern Mediterranean and southern Asia.
在世界许多地区，包括非洲、东地中海和南亚，氟化物浓度都有升高趋势。
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