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-to-back interference背对背干扰back cut-off power recorder反向截止功率记录仪Backscattering lidar equation后向散射激光雷达方程back-up switching equipment进线桥备自投backscattered electron signal反射层电子信号backwash-regeneration cycle反冲洗再生循环back-flushed waste disposal倒灌污水Backing up files from disk.从磁盘备份文件。back-coupled Hall generatorback-pressure-relief port反压泄料孔