backwardly往后地backwardadj.向后的；落后的adv.向后backward conductance反向电导backward implication反向蕴涵backward curve blade后曲叶片backward elimination后向消除, 后向消元backward dislocation后脱位backward supervision反向监控,反向管理backward propagation反向传播backward measurement后向测量Backward oscillation返波振荡backward and forward来回地, 前后地