与典型的服务器或者客户端邮件归档系统相比，这种解决方案的主要优点是，您可以针对现有的邮箱使用它。
The main benefit of this solution over the typical server or client mail filing systems is that you can use it on existing mailboxes.
前两个回调方法：subscribed(int, byte[]) 和 unsubscribed(int) 主要针对想要监视订阅确认的客户机。
The first two callback methods, subscribed(int, byte[]) and unsubscribed(int), are for clients that want to monitor subscription acknowledgments.
这项变化主要针对旅游公司和房产中介，他们利用谷歌地图向客户标示其感兴趣地点的定位。
The change is aimed at travel firms and real estate agents which use Google Maps to show customers a view of locations they are interested in.
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