2. 外语
  3. It is only when people try to live on a very restricted diet that it is necessary to make special provision to supply the missin

It is only when people try to live on a very restricted diet that it is necessary to make special provision to supply the missin

admin2018-08-19  86
问题 It is only when people try to live on a very restricted diet that it is necessary to make special provision to supply the missing vitamins.
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答案只有当人们试图以很有限的饮食为生的时候，特别补充流失的维生素才是有必要的。
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