提出了一套完整的层次结构设计方案综合实现网络的多图显示与分层管理功能。
A complete set of layered structure design is set forth to implement the multi graph display and multi layer management functions of network.
接口所描述的功能可以被任何类型采用，无论该类型显示于继承层次结构中的哪一位置。
The functionality that is described by the interface can be adopted by any type, regardless of where the type appears in the inheritance hierarchy.
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