backuoperation备份: back-up操作: operate; manipulate; handle备份操作员: backuoperators; backuset备份操纵钢索系统: cable backup备份: [计算机] back-up◇备份发射机 stand-by transmitter; 备份技术 redundancy technique; 备份记录 duplicate record下载手机词典可随时随地查词查翻译