folder类支持定制的元数据和包含文档。
The Folder class supports customized metadata and containing documents.
这个对象包含文档文本和关于文本的元数据信息,比如文档语言。
This object contains the document text along with meta information about the text, such as the document language.
Thumbnails文件夹,其中包含文档的一个小. png图像。
Thumbnails, a folder which contains a small.png image of my document.
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