多数用户执行访问控制是通过使用诸如角色和权限这类概念完成的。
Most users perform access control by employing concepts such as roles and permissions.
细粒度访问控制不只是授予或拒绝执行程序或读取数据文件的权限。
Fine-grained access control goes beyond granting or denying the right to execute a program or read a data file.
访问控制可以外化给网络代理，不用再在本地应用里执行。
Access control can be externalized to a network proxy instead of being performed within the local app.
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