备份: back-up副本: duplicate; repetition; copy; ...第四份副本: quadruplicate系统上所有文件的备份副本对照增量备份: incremental backupcpu副本备份: cpu time /备份的副本: backucopy她用打字机打出了原件及两份副本: she typed an original and two carbons那是当然我们每人保留一份正本和两份副本: naturally. each of us keeps one original and two copies副本: duplicate; repetition; copy; carbon; shadow; ditto; transcript; doubles 名单副本 a duplicate list; 文件副本 a duplicate of the document; 声明副本 copies of the statement; 我们寄出了信, 但留有副本。 we mailed the letter but kept a duplicate.; 副本检验 copy check; 副本文件 save file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副本, 第一副本: duplicate copy副本;第一副本: duplicate抄本,副本: tra cription带副本: tape copy副本,副单: copy副本,复本: duplicate副本,俩份: dup;dupl duplicate副本的: duplicate副本提: copy bll副本组: backup copygroup拷贝,副本: duplicate, copy文本;副本: copy硬副本: hard copy复制、副本、拷贝 副本、拷贝: copy备份,备降: al alternate