由于MAC服务在一台终端工作站内以抽象接口的方式提供，因此它不可能指定合适的总数据包传输延时。
Since the MAC Service is provided at an abstract interface within an end station, it is not possible to specify the total frame transit delay precisely.
该方法在中继节点通过校验码等方式判别来自两个终端的数据包是否正确解码后，自适应地进行网络编码、中继转发处理。
Traditional network coding has a limited application for assuming the input packets from two destination nodes can be simultaneously decoded correctly at the relay node.
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