要保存到结构化存储文件，必须输入文件名。
To save to a structured storage file, you must enter the file name.
因而在表示那些通常存储在XML文件中的结构化数据时尤为有用。
This makes them useful for representing the kind of structured data that when stored would commonly be held in an XML file.
系统需要一种以结构化格式存储和检索信息的方法；这就需要文件系统的参与。
The system needs a way to store and retrieve information in a structured format; this is where the filesystem comes in.
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