Traveling wave ultrasonic motor is a new type of actuator driven by friction.

行波超声马达是一种靠摩擦力直接驱动的新型驱动器。

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In the case of all motor vehicles, friction is essential in the operation of the brake.

就机动车辆而言，摩擦力是制动器运作时必不可少的。

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This paper determines standard uncertainty for measurement of windage and friction loss of three-phase induction motor through fitting line of least square method.

本文用最小二乘法拟合的直线确定三相异步电动机风摩耗测量的标准不确定度。

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It smelled of motor oil and friction heat, the way a nineteen-forties Spitfire might.

NEWYORKER: Hand on the Shoulder