Secondly, lazy management of virtual address space and management of two-layer-cached physical memory are analyzed.

随后详细分析怠惰的虚地址空间管理、两级缓冲的物理内存管理；

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More than one virtual address can refer to the same physical memory location.

多个虚拟地址可以指向同一物理地址。

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VMA? Virtual Memory Address?

虚拟存储地址?。

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VMA? Virtual Memory Address?

虚拟存储地址?。

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