问题只在于，大多数普通用户其实卡在门外。
Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.。WPS官方版本下载对此有专业解读
，更多细节参见夫子
My younger daughter, Nava, turned two last week. Among her favorite phrases are “No, Nava do it” and “what da HECK.” Her favorite music, by a wide margin, is Elton John. And her favorite gesture is a hearty, full-body nod. She deploys this repertoire with enormous humor, precision, and grace.
「一直到有工作許可之後，那個生活才慢慢好起來。」關恆說。，更多细节参见safew官方版本下载