主体：主体可以表示从用户、客户端和服务器到单元的任何实体。
Principal: a principal can represent anything from users, clients and servers to cells.
该服务器可让客户端访问由计算单元中的应用程序服务器、节点代理和odr生成的JMX通知。
This server enables the client to access JMX notifications generated by the application servers, node agents, and ODRs within the cell.
已经导入了多个公共策略集，可供附加到服务和客户端组合单元。
Several common policy sets are already imported and ready for you to attach to your service and client composition unit.
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