For example, there could be rules about which users are authorized to use or manage which printers.
例如，可能存在有关授权哪些用户使用或管理哪些打印机的规则。
Add new printers, manage printing jobs, and change printer settings and access.
添加新的打印机、管理打印作业并更改打印机设置和访问权限。
The Operator class, representing the operations staff that manage our printers
操作类，表示员工管理打印的操作。
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