在允许即时更新订阅的发布中，不能从项目中筛选时间戳列。所有的时间戳列都将包含在该发布的项目中。
Timestamp columns cannot be filtered from articles in a publication that allows immediate updating subscriptions. All timestamp columns will be included in the articles of this publication.
客户端订阅一个Hub，当feed有更新时Hub会即时通知客户端。
The client subscribes to a Hub and it is almost instantly notified when the feed is updated.
应用推荐