短语词组短语Backward File Recovery 反向档案恢复;反向文件恢复;反向档案复原;翻译Backward error recovery 后向恢复;反向错误复原;翻译;后向错误校正backward d recovery 向后恢复backward recovery time 反向恢复时间Forward and Backward Recovery 正反恢复块技术 返回 backward recovery