backwardly往后地
backwardadj.向后的;落后的adv.向后
backward dispersion后向散射
Backward of economy经济滞后
backward scattering后方散射
backward dictionary倒排词典
backward-studying向后学习
backward precession逆旋进
backward build-up逆向组句法
backward facilities设备落后
backward brush lead电刷后向超前
backward trajectory后向轨迹