XBB聊天室——管理员用例图.7el7cf2s27o0.svg

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@startuml
actor 系统管理员

系统管理员 -up-> (登录XBB聊天室)
系统管理员 -right-> (查看当前在线用户列表)
系统管理员 -down-> (发送系统消息)
@enduml

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