It is only when people try to live on a very restricted diet that it is necessar

游客2024-01-15  33

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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