If the page is unmodified, the page replacement daemon can simply mark the physical memory block as free, and the physical memory block can then be re-used for another page.
如果该分页没有经过修改，那么分页替换守护进程可以简单地将物理内存块标记为空闲，这样一来，就可以将该物理内存块重用于另一个分页。
The physical memory block that contains the page is marked as free and ready for reuse for additional pages.
将包含该分页的物理内存块标记为空闲，并为其它的分页做好重用的准备。
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