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.
（二）冒用或者未授权使用、关联使用党政机关、企事业单位等组织机构或者社会知名人士的名义，可能对公众造成欺骗或者误导的；
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For some UK concert-goers, the arena has given them opportunities for live music away in the north of England, instead of London.
更重要的是，这条船拒绝8岁以下的儿童登船，这无疑又劝退了很大一部分舍得给孩子花钱的亲子家庭客人。