aggregation relationship

基本解释

Generic aggregation represents hierarchical relationship, namely nesting of elements.
广义聚集实现层次联系，即元素间的嵌套；
Next, create an association relationship between the classes that enables you to choose either an aggregation or a composition relationship.
下一步，在类间创建关联关系，这使您能够在聚集及组成关系中选择一个。
Next, , create an association relationship between the classes that enables you to choose eitheran aggregation or a composition relationship.
下一步，在类间创建关联关系，这使您能够在聚集及组成关系中选择一个。翅。