Tunneling (RFC 2893) : it allows you to encapsulate one packet head into the other and one protocol will communicate with others through the encapsulation in the other protocol.

隧道技术(RFC 2893)：是指将一种协议报头封装在另一种协议报头中，这样，一种协议就可以通过另一种协议的封装进行通信。

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To be sure, there are a lot of mistakes to be made when it comes to moving products from one place to the other, but knowing others have made these common blunders and lived to tell the tale means the challenges are surmountable.

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In the link from any one person to any one other it depends on the manner in which some people are connected to vast numbers of others.

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In other words, one of the reasons we cooperate with others is to avoid feeling guilty.

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