门电机担负着电梯门的动力驱动，若电机过热，会加速绝缘材料老化，缩短电机的使用寿命。
The elevator door was driven by door motor. If the motor was over heated, it would speed up the ageing of insulating material and shorten the life of the motor.
基于伺服电机直接驱动的折弯机数控技术则是一门新兴的技术。
Based on direct drive servo motor CNC bending machine technology is an emerging technology.
当大卫被要求检查发电机，装卸码头的门被延后了外面的东西。
When David is asked to check on the generator, the loading dock door was being pushed by something outside.
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