For any two classes that have some relationship, identify the semantics of the relationship: is it association, aggregation, composition, or inheritance?
对于任意两个之间具有关系的类，确定关系的语义：是关联、聚合、合成还是继承？
Aggregation follows the same rules as association.
集合与关联遵循相同的规则。
Aggregation is a special type of association used to model a "whole to its parts" relationship.
聚合是一种特别类型的关联，用于描述“总体到局部”的关系。
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