backemfn.反电动势
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
backstyle high-jump背越式跳高
backstepping approach反步法
back-up of database备份数据库
backlingual consonant舌根辅音
back-up lamp switch后备灯开关
Back of coat rides up背衩豁开
back against the tide逆潮流
back and forth method选择法
backreflection camera背(反)射照相机
back/forward sweep前推回代法