一个度量必须有一个维列表为空的聚合，其他聚合必须都具有明确的维列表。
A measure must have one aggregation with an empty list of dimensions, and any other aggregations must each have an explicit list of dimensions.
维列表为空的聚合应用于多维数据集模型中没有被其他聚合使用的所有维。
The aggregation for an empty list of dimensions is applied to all dimensions in the cube model that are not specifically being used by another aggregation.
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