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
document t category 文献类目
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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