常见例句between +420 and +589) as a device to allow several farmers to work at the same quern . 译文：到南朝（420-589年）时，又加上了连杆，使几个人能共同推动一盘人力磨。Querné 凯尔内stone quern 石磨盘quern stonen. 磨石 返回 quern