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.
同时，提出了京广、京沪、京哈、陇海四大干线客货列车具体匹配方案及线路客货输运能力最大作为剖别条件的建议。
It puts forward a proposal concerning the practical matching plan for passengenger and freight trains on the four major trunk lines. Taking maximum traffic capacity as the judging criterion.
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.
接着，详细说明时分多路系统在长途主干线路上的应用，以及最近引伸至市内骨干网和接入网的应用。
Then, it describes in detail the application of WDM systems on long distance lines and possible applications in local networks, including those interoffice lines and some access lines.
社会经济效益评价是铁路干线路网规划及建设项目决策的重要前提和依据。
Socioeconomic benefit evaluation is the main precondition and foundation in railway project planning and decision.
新型信号系统安装在乌兹别克斯坦南部的塔日古扎尔至库姆库尔干线路间，全程二百公里，总共有17个站点。
The new signalling system will be installed on the Tashguzar – Kumkurgan line, which is more than 200 km in length serving 17 stations in Southern Uzbekistan.
新型信号系统安装在乌兹别克斯坦南部的塔日古扎尔至库姆库尔干线路间，全程二百公里，总共有17个站点。
The new signalling system will be installed on the Tashguzar – Kumkurgan line, which is more than 200 km in length serving 17 stations in Southern Uzbekistan.
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