If so, how big did a component have to be before it became a subsystem?

假如这样的话，毫无疑问的是它在成为一个子系统以前，一个组件要多大呢？

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Many systems are designed at three primary levels: system, subsystem, and component, as shown in Figure 1.

许多系统是在三个主要层次上设计的：系统、子系统和组件，如 图 1 所示。

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The specification does not treat a component or a subsystem any differently from a modeling perspective.

从建模的观点，规范并不认为组件与子系统有任何区别。

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