通过层次的划分，将网络分成不同的域，将移动结点的切换限制在小范围内。
Through the hierarchy dividing, the network was divided into different domains and the switching of mobile nodes is confined in small scopes.
MVC框架允许开发者几乎没有限制地使用任意一种数据源，并能够轻松地在各种数据源之间进行切换。
The MVC Framework gives developers almost unlimited ability to use any data source and the ability to easily interchange between them.
Bayeux和WebSockets都试图避免资源限制问题，使用回退机制来实现长轮询(比如Bayeux)，或者切换到其他非http协议之上。
Both Bayeux and WebSockets attempt to avoid the resource limits by using a fall-back mechanism for long polling (in the case of Bayeux) or switching to a non-HTTP based secondary protocol instead.
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