You can use the tag to accept potential values from the user and assign the numerical category ID you need to use when submitting the information when making a blog post.
可以使用标记接受用户输入的值并分配一个数字类别ID，在建立blog帖子时需要用这个ID指定类别。
You can also assign more than one Value to a key, for a post.
你可以为一篇文章的一个关键词分配几个值。
The default post Category is Category assigned to a post if you fail to assign any other Categories with writing your posts.
默认文章类别，是在你没有为文章成功地非配其它类别情况下的类别。
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