The protocol informsIP at the destination host whether to pass the packet up to TCP or UDP.
该协议通知目标主机的IP协议程序，究竟是把这个数据包传递给TCP协议还是传递给UDP协议。
At the destination host, the packet is passed up to UDP and delivered to the destination port.
在目标主机，数据包被传递至udp协议程序并送到目的地端口。
Shortly after arriving at our destination, my friend James and I met our host family for the first time.
达到目的地没多久，我和我的朋友詹姆士就第一次见到了接待我们的人家。
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