这个结构用于所有的网络层，用于存储它们的包结构头，其中包含了用户数据的信息(有效负载)，以及它们要动作的其它的内部信息。
The structure is used by all the network layers to store their headers, information about the user data (the payload), and other information needed internally for coordinating their work.
这个结构用于所有的网络层，用于存储它们的包结构头，其中包含了用户数据的信息(有效负载)，以及它们要动作的其它的内部信息。
The structure is used by all the network layers to store their headers, information about the user data (the payload), and other information needed internally for coordinating their work.
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