backwardi滞后
backwardadj.向后的;落后的adv.向后
backward extruding反挤压
Backward Advantage后发优势
backward algorithm逆序算法
backward wave tube回波管
backward selection逆向选择
backward provinces落后省区
backward-surgingadj.逆涌;后涌
backward induction逆向归纳法
backward direction反向, 后向
backward signaling反向信令