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自从贝尔发明电话后的一个多世纪以来，人们在地下埋设了密密麻麻的电话线，总数已经超过了７亿条，而且这个数字还在不断增加。 当人们耗费巨资和大量人力埋设光缆，发射通信卫星时，贝尔实验室的研究人员并没有忘记这７亿多条看似与“信息高速公路”格格不入的铜线。根据当时
More than a century after Bell invented the telephone, people buried underground with dense telephone lines, totaling more than 700 million, and the number is still rising. When people spend huge sums of money and manpower laying fiber optic cables and launching communications satellites, Bell Labs researchers have not forgotten the 700 million copper lines that appear to be alien to the “information superhighway.” According to the time