Programs must sometimes enforce their own access control requirements on resources they are responsible for and on user accounts not recognized by the operating system.
对于所负责的资源和操作系统无法识别的用户帐户，程序有时必须强制实施它们自己的访问控制要求。
They are responsible for the control of user access to the network.
他们的责任是控制用户对网络的访问。
The hub repeater is responsible for managing connectivity on a per packet basis, while the hub controller provides status and control, and permits host access to the hub.
集线器中继器负责管理基于包的连接，而集线器控制器则提供状态信息和控制操作以支持主机访问。
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