The physical hardware might have a large amount of memory, but the hypervisor might designate only 1gb of that memory for a particular virtual system's use.

物理硬件可能拥有大量的内存，但是虚拟监管系统为特定虚拟机系统的使用只分配了1 GB的内存。

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Therefore, that virtual system appears to be running on a piece of hardware (that is, a virtual server) with only 1gb of memory.

因此，虚拟机系统看起来好像是在一个只有1 GB内存的硬件(其实就是一个虚拟机服务器)上运行。

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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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