backup
.名词 n.
1.帮助；援助；支持
military backup
军事援助
2.替代物;备用品;支援人员, 后备, 后补, 助手
a backup singer for stevie wonder
史蒂维·旺德的伴唱歌手
the hospital has a backup generator in case there is a power failure.
医院有备用发电机以防停电。
she once sang backup for madonna.
她曾经为麦当娜伴唱。
3.(流水受阻造成的)阻塞；泛滥；(车辆等)拥塞
4.备份文件
a backup disk
备份磁盘
have you kept a backup of this file?
你把这文件备份了吗?
we had no computer backup and had to rely on old paper files to reconstruct the records.
我们没有计算机备份,只得靠落后的纸档案重做记录。
备份
