v设置详细模式，以便在创建映像时获得运行注释。
V sets verbose mode, for a running commentary as the image is created.
因为在这个命令的两个部分中都使用了详细模式，所以可以确认创建的和提取的存档的大小是否相同。
Because you use verbose mode in both portions of the command, you can confirm whether the size of the archive created and extracted is identical.
在上面的示例中，已经切换到了详细模式，这将确保记录原始数据包的全部内容，而不仅仅是snoop在缺省情况下所提供的摘要信息。
In the above example, verbose mode has also been switched-this ensures that the full contents of the raw packets are recorded, instead of just the summary information that snoop provides by default.
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