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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The Aggregation property is important for complex types: it has to be set to Composition for attributes of a class type and Shared for attributes of metaclass or stereotype.

聚合属性对于复合属性集非常重要：它必须要为类的属性设置成 Composition 并且为元类的原型类型设置为 Shared 。

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The effect of collagen and chitosan on aggregation property of pulp is studied.

研究了胶原蛋白和壳聚糖对纸浆纤维絮聚性能的影响。

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