backwardi滞后backwardadj.向后的；落后的adv.向后backward vesistor反馈电阻backward-drivenn.后向驱动backward movement反向运动backward position反转位置,回程位置backward flushing反冲洗backward transfer逆向迁移backward pressure[医] 反压, 回压backward learning反向学习backward thinking落伍思想; 思想倒退backward rotation后旋转