The mapping of virtual memory to physical memory occurs through page tables, which are implemented in the underlying hardware (see Figure 1).

虚拟内存到物理内存的映射通过页表完成，这是在底层软件中实现的(见图1)。

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Each virtual portal has one specific URL mapping referencing its content root.

每个虚拟门户都有引用其内容根的特定url映射。

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For each running process, the mapping between virtual and physical address is maintained in a data structure called the page table.

对于每个正在运行的进程，虚拟地址与物理地址之间的映射是在一个称作页表的数据结构中维护的。

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And (speaking of real estate) which sort of ad is more likely to sell a house nowadays: the newspaper's truncated description with a single, low-resolution thumbnail, or a virtual tour with live mapping services and geographical and geopolitical information with feature comparisons to other properties available?

CNN: Why dirty up my hands with newsprint?

Philip Nuber, director of the Defense Mapping Agency, says that using this virtual technology in flight simulation can help soldiers in peace time as well as war.

CNN: Pilots study virtual terrain of Bosnia