Roller coasters have three basic parts – thetrack, the train, and a motor.

过山车有三个基本部分——轨道、车体和动力设备。

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Its drivers may choose to use speed motor, a roller in two ways.

其驱动可选用减速电机、电动滚筒两种方式。

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Secondly, the research status of fault diagnosis in roller bearing and asynchronous motor is summarized.

介绍了异步电机及滚动轴承故障诊断的国内外研究现状。

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Ninon (Nathalie Richard), a compulsive thief who loves to dance, is a motor-scooting and roller-blading messenger on the run from the police.

NEWYORKER: Up/Down/Fragile