它显示系统中真实内存和虚拟内存的使用量和空闲量。
It shows the used and free sizes of real and virtual memory in the system.
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.
标签中的第四行显示，当前堆的大小大约为6MB；在这个GC周期中，大约释放了1.7 MB的内存，目前，有31%的堆是空闲的。
The fourth line in the tag shows the current heap size is roughly 6mb; in this GC cycle roughly 1.7 MB was freed and currently 31% of the heap is free.
标签中的第四行显示，当前堆的大小大约为6MB；在这个GC周期中，大约释放了1.7 MB的内存，目前，有31%的堆是空闲的。
The fourth line in the tag shows the current heap size is roughly 6mb; in this GC cycle roughly 1.7 MB was freed and currently 31% of the heap is free.
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