正常情况下如果饮食搭配合理，就可提维持人体健康必须的各种维生素。

Normally a well-mixed diet can supply the vitamins necessary for a healthy body.

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选择的品种是如此地稀少以至于顾客不能从中选择一个能量密度搭配合理的饮食。

The choice is so limited that it's virtually impossible to select a combination of items with even a moderate energy density.

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