Specify -7 (days) as the start offset and -3 (days) as the end offset.
指定-7（天数）作为开始偏移量，-3（天数）作为结束偏移量。
If the raw device is not large enough for the new chunk end offset, the extension will fail.
如果原始设备对于新块结束偏移量不够大，扩展就会失败。
If this is a local variable within a scope, the end offset will fall within the offsets defined for the scope.
如果此变量为某个范围内的局部变量，则结束偏移量将位于为此范围定义的偏移量界线内。
If this is a local variable within a scope, the end offset will fall within the offsets defined for the scope.
如果此变量为某个范围内的局部变量，则结束偏移量将位于为此范围定义的偏移量界线内。
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