physical memory free 物理可用内存 ; 可用物理内存 ; 当前的可用内存
C - amount of free physical memory.
c—空闲物理内存量。
When free physical memory starts getting low, programs that have not used recently are moved from ram to paging space to help release physical memory for more real work.
当空闲的物理内存较少时，可以将最近没有使用过的程序从RAM转移到分页空间，以帮助释放物理内存，从而完成更多的实际工作。
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.
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。
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