系指京哈（不含沈山线）、京沪、京广、京九（含广州至深圳段）、陇海、沪昆（不含株洲至昆明段）线及客运专线。
本文从能源方面探讨了我国运输繁忙干线实现铁路电气化的意义。
This article, in regard of energy sources, explores the significance of electrifying the heavily trafficked railway main lines in our country.
高斯密斯说，洛杉矶有1,200英里长的自行车道，但很多都在繁忙的干线道路旁，汽车和自行车争道现象严重。
Ms. Goldsmith says the city has 1, 200 miles of bikeways, but many of those are along busy thoroughfares on which cars and bikes compete for space.
高斯密斯说，洛杉矶有1，200英里长的自行车道，但很多都在繁忙的干线道路旁，汽车和自行车争道现象严重。
Ms. Goldsmith says the city has 1,200 miles of bikeways, but many of those are along busy thoroughfares on which cars and bikes compete for space.
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