This allows the design of an application to focus on the component parts, and hand off messages to the communication layer for delivery.
这使得在设计应用的时候，可以只关注于组件部分，而把消息传递给通信层去递送。
2
In this scenario, a dishonest delivery boy surreptitiously delivers new instructions for the office workers' manual that instruct personnel to hand over all the office's money when he requests it.
在这个场景中，一个不诚实的男孩暗中更改了条例，当他需要时就可以指示员工将办公室的钱移交出来。
3
Content providers have the growing need for targeting the delivery of dynamic content to several different consumer mediums, ranging from Web browsers to hand-held mobile devices.