发电机使机械能转换为电。
执行元件：把液压能转换为机械能的各种装置。
Actuator: a device for converting hydraulic energy into mechanical energy.
热由此转换成活塞的机械能。
Heat is thereby converted into mechanical energy of the piston.
电动机把电能转换成机械能。
An electric motor turns electrical energy into mechanical energy.
利用发电机，可以将机械能再转换成电能。
The mechanical energy can be changed back into electrical energy by means of generator.
利用发电机，可以将机械能再转换成电能。
The mechanical energy can be changed back into electrical energy by means of generator.
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