backward pig发育不良的仔猪backwardadj.向后的；落后的adv.向后backward condition probability后向条件概率Backward propagation algorithm反向传播算法backward extrusion punch shape反挤压凸模形状backward elimination procedure反向淘汰法backward wave oscillating tube回波振荡管backward differentition method[计] 后向差分法backward of countryside novels乡土作品的停滞backward recursive probability后向递归概率backward / 'bAkwEd/ a.backward-sloping supply curve向后倾斜供给曲线