发布者通常向消息添加一个主题头部，根据通知的主题模型或分类模式确定该消息的类别。

Publishers typically add a topic header to the message that classifies the message according to the topic model or classification scheme of the notifications.

youdao

发布者通常向消息添加一个主题头部，根据通知的主题模型或分类模式确定该消息的类别。

Publishers typically add a topic header to the message that classifies the message according to the topic model or classification scheme of the notifications.

youdao