I got to know that the only water source in some villages contain all but High-Fluoride water (over 7.8mg /L).But the limit should be 1 mg/L.

• 笔者了解到，即使有的村落仅有的一点水源，也是高氟水，水的含氟量达到7.；8毫克／升，而国家规定安全饮用水的最高界限是1