近年来，内部网络和外部网络的边界变得模糊。
The boundary between the internal and external network has blurred over the years.
IP在底层物理网络的边界之间提供最基本的数据报传递形式。
IP provides the most basic form of datagram delivery across the boundaries of the underlying physical networks.
网关作为网络的边界，主要任务是将一种协议转成另一种协议。
As the boundary of the two kinds of network, the main task of gateway is to transfer one protocol to another.
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