An important and often difficult decision to make is whether an aggregation level actually is an element of a (structural) hierarchy, or whether it simply is a property of an item in the dimension.

一个通常难以做出的重要决策就是一个聚集层是否真正是(结构化)层次结构的一个元素，或它是否仅仅是维度中一项的属性。

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An important and often difficult decision to make is whether an aggregation level actually is an element of a (structural) hierarchy, or whether it simply is a property of an item in the dimension.

一个通常难以做出的重要决策就是一个聚集层是否真正是(结构化)层次结构的一个元素，或它是否仅仅是维度中一项的属性。

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