如前所述，进程所引用的内存地址是虚拟地址，需要将其转换成物理地址。
As mentioned before, memory addresses that are referred by a process are virtual addresses and require translation to the physical address.
访问操作系统提供的内存地址要比读取(物理内存中的)常驻地址慢很多，因为必须硬盘驱动器加载它。
Accessing a memory address that has been swapped is a lot slower than reading a resident (in physical memory) address because it must be loaded from the hard drive.
每次为程序指令或数据处理内存位置时，都需要将虚拟地址转换成物理(或实际)内存地址。
Every time a memory location is addressed for program instructions or data, a virtual address is translated into a physical or real memory address.
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