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我孩子因患有哮喘最近住院一段时间,出院时医生说了一些注意事项,还特地让我们适当给孩子补充点维生素 A,请问这是为什么啊?
My child recently hospitalized for asthma for some time, the doctor said a few precautions when discharged, but also specifically let us add some vitamin A to children, may I ask why ah?