This exceeds the virtual memory capacity of the process; so much of the data lives on disk, which is expensive to access.

这超出了虚拟内存的处理容量；因此许多数据位于磁盘中，访问磁盘的开销很大。

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When a process allocates memory it does so by first reserving virtual memory and then committing memory out of this chunk (this is the memory actually used).

一个进程分配内存时，它是这样进行的：首先，预定虚拟内存；然后，提交内存到该块中(这是实际使用的内存)。

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The physical memory that is mapped for the guest operating system is actually virtual memory mapped into the process.

映射给客户操作系统的物理内存实际上是映射给这个进程的虚拟内存。

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