crippling fluorosis 中文意思是什麼
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The presence of fluoride ion in drinking water may be beneficial or detrimental to people health depending on its concentration. drinking water with the concentration of fluoride kept within prescribed limits can reduce dental cavities and enhance the bone. however, when water supplies contain excessive fluoride concentration, it can result in dental or fluorosis, more severely it can cause crippling
氟是人體內維持骨骼正常發育必不可少的成分，但是氟的攝取量在有利和有害之間的變化范圍極窄，長期飲用高氟水可導致氟斑牙，嚴重者導致骨骼變形、疼痛，關節僵硬，筋腱鈣化，行走困難，以致癱瘓。
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