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蜡梅不惧严寒酷暑，低温下香气更为明显。宜昌也曾经历过高速发展带来的阵痛，作为长江流域最大的磷矿基地，2016年化工产业产值分别占全市工业和全省化工的近1/3。然而，亮眼的数据隐藏着“生态欠账”。2017年初，宜昌因“化工围江”被中央生态环保督察组批评。
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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.，详情可参考91视频
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