求翻译：电动推车机主要由驱动总成，推杆小车，轨道，链条链轮传动机构等组成。推车速度变频可调，推进过程采用慢速启动，快速行进，慢速停止；推杆小车返回采用快速返回。是什么意思？

The electric cart machine is mainly composed by the drive assembly, putting the car, rail, chain sprocket drive mechanism. Cart speed frequency is adjustable, to push forward the process of a slow start, fast moving, slow stop; putter car to return to using the quick return.

Electric cart by the main drive assembly, push rods, trolley tracks, chain sprocket drive. The speed and frequency can be adjusted to a slow start, fast-moving, slow-speed stops; car pusher is a quick return to return to.