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System Computer & System Hardware & System Installation & System Upgradation (系统硬件 & 系统安装 & 系统升级)
System User & System Privilege (系统用户 & 系统权限)
System Operation & System Setting & System Software (系统操作 & 系统设置 & 系统软件)
System Storage & System Directory & System File (系统存储 & 系统目录 & 系统文件)
System Process & System Performance (系统进程 & 系统性能)
System Network & System Security & System Log (系统网络 & 系统安全 & 系统日志)
Classification by Large Category (按大类分类)
Classification by Sub Category (按子类分类)