The file variable can then be associated with another external file.

此时,文件变量可以被关联其他的外部文件.

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Associates the name of an external file with a file variable.

的意思是将外部的文件名关联到文件变量上.

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A file variable is any variable whose type is a file type.

文件变量就是其类型是文件类型的任何变量.

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Unique syntax for accessing additional file variable information , called metadata, is also useful.

用来存取额外的文件变量信息(元数据)的特定语法也是很有用的.

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