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-and-foot technique用背和脚作支点的登攀法
back sliding step technique背向滑步技术
back filling behind abutment台背回填
Back - propagation network反向传播网络
back-connected stone panel背部连接面板
back-leaning angle of body躯干后倾角
backcross quantitative trait回交定量性状
Back and Forth in Bangladesh孟加拉的前进与倒退