c—空闲物理内存量。
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。
The physical memory block that contains the page is marked as free and ready for reuse for additional pages.
该命令显示系统中的空闲内存、已使用的物理内存和交换内存的总量，以及内核所使用的缓冲区。
The command displays the total amount of free, used physical, and swap memory in the system, as well as the buffers used by the kernel.
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