backmen后卫backn.后面；背脊；靠背；后背；后卫vt.支持；后退adv.向后地adj.向后的；后面的；偏远的；过时的；积欠的back well method excavation反井法开挖back-and-knee technique用背和膝盖作支点的攀登法BACK POCKET WIDTH AT BOTTOM后袋宽下边量Back step shot with jump.后撤步跳投。back saw with wooden handle木柄手锯back pressure steam turbine背压式汽轮机Back in the saddle again.回归原位。backscattering coefficients后向散射系数Back-projection algorithm后向投影算法Back up file sequence error备份文件顺序错误