Vitamins can only be of assistance if the dietary vitamin intake is inadequate.
维生素只能援助，如果饮食中的维生素摄入不足。
Vitamins can only be of assistance if the dietary vitamin intake is inadequate.
只有在膳食中摄取维他命不充分的时候， 维他命才能发挥作用。
The reasons why vitamin deficiencies arise are many and varied but not leastdue to an inadequate feed intake (for management reasons) which is inextricablylinked to inadequate vitamin intake.
维生素缺乏症的原因是多种多样的，但是相当重要的是不充足的饲料采食量（管理原因），这很难避免维生素摄入不充足。
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