在计算机系统中，为了提高主存利用率，往往把辅助存储器（如磁盘）作为主存储器的扩充，使多道运行的作业的全部逻辑地址空间总和可以超出主存的绝对地址空间。用这种办法扩充的主存储器称为虚拟存储器。通过本实习帮助同学理解在分页式存储管理中怎样实现虚拟存储器。-In the computer system, in order to enhance the utilization of main memory is often the auxiliary memory (such as disk) as the main memory expansion, so that multi-channel running the entire operation logical address space can be in excess of the sum of the absolute main memory address space. In this way the expansion of the main memory is called virtual memory. Through this internship to help students understand the paging memory management how to implement virtual memory.