Study participants will take 2, 000 I.U. 's of vitamin D3, believed to be the form most easily used by the body.
试验参与者将服用2000国际单位的维生素d3，维生素d的这种形式被认为最容易为人体利用。
2
Cow \ \ \ 's milk contains a fair amount of fat and cholesterol, is practically devoid of Vitamin c, and has three times the amount of sodium compared to human milk.
牛奶包含着大量的脂肪和胆固醇，几乎没有维生素c，且钠含量是人奶的三倍。
3
Vegetable is the best source of svitamin, because vegetables are rich in vitamins.