The machine also has its own heat sources: motors, friction from machine motion, and the cutting action of the tool on the work piece.

热力因素：来自内部和外部的热量是床身变形的主要原因。

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It's based on the combination of software and hardware that motion control realizes the good precision of position control and speed control in machine motion.

运动控制是通过软硬件的方法来实现机械运动精确的位置控制、速度控制和加速度控制等。

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He pulled the lever and set the machine in motion.

他扳动操纵杆，启动了机器。

《牛津词典》

That would that would give rise to a perpetual motion machine, breaking of the second law. It can't happen.

否则就会使,得永动机出现，打破第二定律那是不可能的。

麻省理工公开课 - 热力学与动力学课程节选

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