此外，它的分层结构也保证了它是一个可行的系统。
Moreover, its layered structure can also ensure it's a practical system.
解决系统复杂性的一种方式是以分层的方式分解结构和行为。
One way to deal with system complexity is to decompose both structure and behavior in a hierarchical way.
UML2(以及UML - RT)支持结构化的类和结构分层，此支持是处理大型系统时的基础。
UML2 (as well as UML-RT) has support for structured classes and structure hierarchy; this support is fundamental when dealing with large systems.
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