街道底下，头顶上方，还有无数家庭和办公室蜿蜒蔓布着铜质线路，它们是电信通讯较早时期的干线要道。

NESTLED underneath streets, hung high overhead and worming their way through homes and offices are copper wires, the arteries of an earlier era of telecommunications.

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边际网关路由协议是因特网骨干线路的关键组成部分之一。

Border Gateway Protocol (BGP) is a key component of Internet backbone, and plays a very important role.

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