在一些最早的存取控制系统中，人们用角色来分隔安全管理和系统管理。
People use it to separate the management of system from security in the access control system.
出于对安全因素的考虑，公路有宽阔的车道和路肩、中央分隔带、界限、长长的出入口车道、为安全转弯而设计的弯道，以及限定数量的入口。
Built with safety in mind, the highways have wide lanes and shoulders, dividing medians, or barriers, long entry and exit lanes, curves engineered for safe turns, and limited access.
对虚拟机的网络和安全控制职责可能没有很好地分隔。
Duties for network and security controls of virtual machines may not be well separated.
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