他们在地道里搭建了钢管用以支撑这条穿过了一条国家的主干道的地道，还在地道里安装了照明和通风系统。
They put in metal beams to support the tunnel as it ran under one of the country's main highways, and they installed lighting and ventilation.
论文从城市交通系统管理和交通信息服务的角度，阐述了城市主干道los的内涵。
This paper explained the meaning of LOS in urban arteries from the prospect of advanced urban traffic system management and information service.
北京有一个公交优先系统，城区的主干道上都设有公交专用道，使得您比自己开车去要快。
We have a bus priority system in Beijing and along each main street downtown there is an exclusive bus lane which allows you to get to your destination faster than if you drove there.
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