backward pig发育不良的仔猪
backwardadj.向后的;落后的adv.向后
backward transfer admittance反向转移导纳
backward characteristic line后向特征线
backward slides step shot put背向滑步推铅球
backward-shifting technique后向平移技术
backward vertical integration后向一体化
backward wave oscillator tube返波振荡管
backward Monte-Carlo method反向蒙特卡罗法
backward-differnece formula反向差分公式
backward bending supply curve向后弯曲供给曲线