The foremost design goal of IP is to cross multiple, physically different networks.
IP的首要目标是要跨越多个不同物理网络进行连接。
Can support a single goal to send, but sending does not support multiple targets.
可以支援单一目标发送，但不支援多个目标发送。
Can support a single goal to send, but sending does not support multiple targets.
可以支援单一目标发送，但不支援多个目标发送。
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