角色类型可根据不同系统的需求而变化。
Role types can vary according to the requirements for different systems.
第三类攻击最难发现与解决，原因入侵者就是内部人员，他可以根据不同系统随意修改软件或硬件。
Class 3 attacks are the most difficult to resolve and detect as the perpetrator is an insider. The perpetrator may modify software or hardware for the system at will.
不同系统结合入项目中，用以根据内部空间的需求引入、渗透或限制各种元素。
Different systems were incorporated into the project to bring in, filter or block the elements as required by the interior space.
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