She had been a streetcar conductor for several years; what she liked about the job was the uniform and the constant motion, the changing scenery and the wheels rolling under her feet.

她干了几年有轨电车售票员的工作了；她所喜欢这项工作的原因是因为那身制服和频繁的移动，路经过的那些变化的景致和她脚下滚动的车轮。

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A coasting performance test is simulated on a chassis dynamometer, the transmission resistance, rolling resistance of wheels and their speed factors are measured.

利用底盘测功机模拟道路滑行试验，测定出汽车的传动系阻力、轮胎滚动阻力及它们的速度影响系数。

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A new rolling resistance (coefficient) test system is developed based on wheel torque sensor, which offers a new method for deeply researching the rolling resistance of the wheels on the rollers.

开发了基于车轮力传感器的底盘测功机上轮胎滚动阻力(系数)的测试系统，为深入研究轮胎在滚筒上的滚动阻力提供了新方法。

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