... traffic control projector 航管信号灯 traffic density 运量密度 traffic guidance loran (TG loran) 导航洛兰 ...
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运量密度
Traffic density
以上为机器翻译结果，长、整句建议使用 人工翻译 。
近年来铁路提速和重载运输的大力发展、客货运量和行车密度大幅度增长，导致钢轨磨耗日益严重。
Recent years, with the rapid development of railway transportation, and the grate increase in the capacity of trains for passengers and goods, the rail abrasion becomes a serious problem.
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