现在，讨论实现这个子系统的主要结构。
Now I'll look at the major structures that implement this subsystem.
组件模型为子系统、模块和组件的层次结构分配需求和职责。
The component model allocates requirements and responsibilities to a hierarchy of subsystems, modules, and components.
通过分解聚集和继承层次结构，您简化了模型，在定义子系统时使其更易分析。
By collapsing aggregation and inheritance hierarchies, you simplify your model, making it easier to analyze when you define subsystems.
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