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.
然后由操作系统处理，操作系统可能会寻找一块空闲内存，为它建立一个新的PTE，映射到被请求的虚拟地址。
The operating system then handles the situation, perhaps by trying to find a spare frame of ram and set up a new PTE to map it to the requested virtual address.
虽然系统为单独进程选择虚拟地址，它维护各个段的相对位置。
Though the system chooses virtual addresses for individual processes, it maintains the segments' relative positions.
虽然系统为单独进程选择虚拟地址，它维护各个段的相对位置。
Though the system chooses virtual addresses for individual processes, it maintains the segments' relative positions.
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