为了使客车和货车都能在同一线路上安全、平稳地运行，则必须对轨道不平顺与车辆运行平稳性和安全性之间的关系进行研究。
To ensure safe and stabile running of both passenger and freight trains on the same line, the relationship between train running safety and stability and track irregularities must be studied.
译：汽车通过凹凸不平的路面时，悬架系统通过实现车轮的上下运动，使汽车更加平稳地行驶在不平擎的路面上。
The suspension system allows a vehicle's tire and wheels to move up and downover bumps and holes in the road. It makes the vehicle ride more smoothly over roughroads.
车在崎岖不平的路上不能平稳地行驶。
车在崎岖不平的路上不能平稳地行驶。
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