因此，有越来越多关于城市铁路运输系统的研究。
As a result, more and more research is being done on the study of urban transit railway systems.
他们受雇于拥有及经营重型设备的公司，重型设备经销商，出租及服务机构，以及铁路运输企业和城市公交系统。
They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
铁路运输包括城市高速铁路、地铁、轻轨、有轨电车。
Railway transportation includes urban express railways, subways, light rails, and trolley cars.
他们受雇于铁路运输公司和城市公交系统。
They are employed by railway transport companies and urban transit systems.
他们受雇于拥有和经营重型装备的公司，重型装备经销商，租赁和服务机构，以及铁路运输企业和城市轨道交通系统。
They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
本文分析了铁路运输和汽车运输对城市环境的主要作用途径和交通污染水平的影响因素；
The primary ways in which railway transport and highway transport have effects on urban environment and factors affecting traffic pollution level are discussed.
近几年，动车组以其编组灵活、方便、快捷、安全，可靠、舒适等优势备受世界各国铁路运输和城市轨道交通运输的青睐。
Recently, CRH is famous for its convenience, safety, comfort, high-speed, flexible organization and favored by railway transportation and city orbit traffic transportation.
近几年，动车组以其编组灵活、方便、快捷、安全，可靠、舒适等优势备受世界各国铁路运输和城市轨道交通运输的青睐。
Recently, CRH is famous for its convenience, safety, comfort, high-speed, flexible organization and favored by railway transportation and city orbit traffic transportation.
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