Thisformula can be used to evaluate the relative changes of engine specific fuel consumption caused by the relative changes of engine moving parts mass during engine design and practical operation.

在发动机设计阶段和发动机实际使用中，可以应用这个公式，估计运动件质量变化所引起的比油耗的相对变化。

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Friction between moving parts had caused the engine to overheat.

活动部件的摩擦使发动机过热。

《牛津词典》

Crankshaft is an important part of truck engine parts, and it is also a fast moving parts.

曲轴是一个重要的组成部分卡车发动机部件，而这也是一个快速移动的零件。

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The U.S. Department of Energy researchers have designed a remarkably simple, energy-efficient engine with no moving parts.

CNN: Lab develops engine for the future