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。
The structural function model can be obtained by composing the sub-functions using these composition relationship.
系统的功能结构模型由子功能通过这些组合关系组合得到。
The structural function model can be obtained by composing the sub-functions using these composition relationship.
系统的功能结构模型由子功能通过这些组合关系组合得到。
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