But the drugs cannot reverse brain damage that has already occurred, and they carry risks of their own because they also strip useful metals from the body, such as iron and zinc.
而这种药物无法弥补已产生的大脑损伤，且药物本身存在风险，因为它们也会将有用的金属元素，如铁与锌一并剥离排出体外。
Lead causes brain damage by mimicking helpful metals found naturally in the body, such as calcium, iron and zinc, and binding with the same molecules and proteins.
通过模拟有助人体、自然存在的金属元素，诸如钙、铁、锌，并结合相同的分子与蛋白质，铅会导致大脑损伤。
Zinc deficiency impairs brain and motor functions and causes roughly 400,000 deaths a year.
缺锌对大脑与运动神经功能有害，每年近40万人因缺锌死亡。
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