document base，documentary information carrier，medium of data 文献载体 document category 文献类目,文献范畴 document collection 文献汇编 ..
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Document Category and Classification 文件类别
document category matrix 文献类目矩阵
Purchasing Document Category 凭证类别
activity document display category 作业凭证显示类别
Category of Document 文件种类
On large amount of document category quantity, hierarchical text classification is an effective approach.
在文本分类的类别数量庞大的情况下，层次分类是一种有效的分类途径。
Then, you learned how to add a subscription feature so we can notify our users by email when new documents are added to the document category to which they are subscribed.
然后，学习了如何添加订阅特性，这样当用户订阅的文档类别中添加了新文档时，我们就可以通过电子邮件通知他们。
What if there was a way for any user to be notified when a new document is uploaded to a specific category?
当一个新文档被上传到一个特定类别时，如果有一种方式来通知用户，那么会怎样呢？
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