This means that additional users can be added with relatively little increase in total costs, and a decline in average cost per user.

这就意味着，新增的服用者，只会带来总成本的相对小额上升，以及每个服用者平均成本的下降。

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Average cost of the user queries that could be reduced by the index in the group.

可通过组中的索引减少的用户查询的平均成本。

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Average cost of the user queries that could be reduced by the index in the group.

可通过组中的索引减少的用户查询的平均成本。

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