people who do not get enough vitaminPeople who do not get enough vitamin A in their diet may develop night blindness.But in the developing world a lack (缺乏) of vitamin A causes much more serious harm to children.According to the WHO,as many as 25
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![people who do not get enough vitaminPeople who do not get enough vitamin A in their diet may develop night blindness.But in the developing world a lack (缺乏) of vitamin A causes much more serious harm to children.According to the WHO,as many as 25](/uploads/image/z/9253791-63-1.jpg?t=people+who+do+not+get+enough+vitaminPeople+who+do+not+get+enough+vitamin+A+in+their+diet+may+develop+night+blindness.But+in+the+developing+world+a+lack+%28%E7%BC%BA%E4%B9%8F%29+of+vitamin+A+causes+much+more+serious+harm+to+children.According+to+the+WHO%2Cas+many+as+25)
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