而事实上，证书可能会散放在某人的工作站或移动电脑上，并且提供的物理访问控制非常小，这进一步复杂化了该问题。
This is compounded by the fact that the certificate may be "in the wild" on somebody's workstation or mobile computer with minimal physical access controls.
内存管理单位，把虚地址转化为物理地址并且提供访问许可控制。
MMU Memory Management Unit, translates virtual to physical addresses and provides access permission control.
通过提取网络层和物理层中的一些信息，可以改进MAC(介质访问控制)层协议的设计。
The design of MAC protocol can be improved by extracting information in network and physical layers.
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