This function takes the source node and copies it over as a child under the destination node.
此函数接受源节点，并将其作为子节点复制到目标节点下。
The time the datagram remains on the Internet is measured in hops, where one hop represents one gateway on the datagram's path to the destination node.
数据报在因特网上保持的时间以跳跃点(hop)衡量，其中一个跳跃点表示数据报通向目的地节点路径上的一个网关。
Then the destination node jointly decodes the messages from the source and relay nodes. We call such a procedure as a network LDPC code.
目的节点可以利用源节点和中继节点的信息进行联合译码，我们称之为网络LDPC编码。
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