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。