这是一个难题，尤其涉及到维生素d时，联邦准则建议这种维生素儿童摄入量应为每天400iu，相当于4杯8盎司玻璃杯的牛奶。
That's a problem, particularly when it comes to vitamin D. Federal guidelines recommend that children get 400 I.U. of the vitamin a day, equivalent to four 8 oz. glasses of milk.
在南美部分地区，缺乏维生素 A 是一个严重的健康问题，尤其在儿童之中。
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children.
十大事业中的前五项就包括营养：儿童补充维生素，食盐加锌和碘以及农作物增加微量元素(如红薯)。
Five of their top ten involved nutrition: vitamin supplements for children, adding zinc and iodine to salt and breeding extra micronutrients into crops (like those sweet potatoes).
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