Paging a memory block out and back in from disk is significantly slower than accessing it directly from RAM, so you should generally avoid this practice.
与直接访问RAM中的内存块相比，把内存块交换到磁盘并交换回来要慢得多，所以一般情况下应该避免这种做法。
In a virtual storage system, a fixed-length block of contiguous virtual addresses copied as a unit from memory to disk and back during paging operations.
在虚拟存储系统中，一个固定长度的连续虚拟地址块，在分页操作过程中它作为一个单位在内存和磁盘之间来回复制。
Applications like Web catalogs, multi-page sales reports and others make extensive use of paging, fetching a new block of data for each new page displayed.
诸如web目录、多页销售报告之类的应用程序都大量使用分页，为显示的每个新页面抓取一块新的数据。
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