As a file, the appliance has some useful properties-for example, you can duplicate it (for backup purposes) as well as move it between hypervisors (called VM migration).

作为一个文件，虚拟设备拥有一些有用的特性—比如，复制(以便备份)和在多个管理程序之间移动(称为VM迁移)。

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Populating a file like this by hand runs the risk of inadvertently creating duplicate IP addresses or host names, so this is a good example of using the built-in command line to eliminate user errors.

手动填充这样的文件有可能会创建重复的 IP 地址或主机名，因此这是使用内置命令行消除用户错误的好例子。

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Please sign a copy of our Sales Contract No.156 enclosed here in duplicate and return to us for our file.

请会签第156号销售合同一式两份中的一份，将它寄回我方存档。

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If a person uploads a file that has already been uploaded by someone else, no duplicate is made and the original is just shared in its place.

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