They trained horses, stocked furnaces, made tires, stood on assembly lines, welding parts onto refrigerators or lubricating car engines.

他们训练马匹、填塞炉膛、制造轮胎，站在装配线上将零件焊接到冰箱，或是给汽车发动机上润滑剂。

Soon, robots were stacking pallets, welding parts, painting cars and much more.

很快，机器人就开始堆垛托盘、焊接零件、给汽车喷漆等等。