高速铁路列车速度快、行车密度大，要求牵引功率高，电力牵引成为高速铁路动力牵引的必然选择。
For the rapidity and traffic density of trains on high-speed railway, larger traction power is needed, so the electric power supply is adopted.
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.
本文根据四大干线的技术条件，论证了提速客货列车的牵引质量，运行速度，行车密度间的合理匹配。
Based on the technical conditions of the four major trunk lines, this article demonstrates the rational match between hauled weight, operating speed and traffic density.
现阶段我国铁路的行车密度已经居于世界前列，行车速度提高的余地又不大，相比之下提高列车重量有着很大的潜力。
It is clear in our county that the traveling density of the railway is very high in the world and it is hard to increase the traveling speed now compared with the huge potentiality of vehicle load.
木橱柜提供高密度存储，例如鞋架、厨房用具、设备，还有用于存放户外运动工具和自行车的步入式衣帽间。
The timber cabinets provide high density storages, such as shoe racks, kitchenware, equipments, as well as a walk in wardrobe for outdoor sport gears and bicycles.
骨骼扫描显示，与对照组相比，几乎所有自行车手的脊柱骨密度都显著偏低。
Bone scans showed that almost all of the cyclists had significantly less bone density in the spine than the control group.
密苏里大学的的研究员把跑步者和骑自行车的人的骨骼密度比较后说：跑步比其他的有氧活动更能强健骨骼。
Running strengthens bones better than other aerobic activities, say University of Missouri researchers who compared the bone density of runners and cyclists.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
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