backup
美[ˈbækˌʌp] adj.备用的，后补的；支持性的；伴奏的
网络备份；备份当前系统；备份方式；备份的
1 . Every part of the system has a backup .
系统的每个部分都有备用元件。
来自柯林斯例句
2 . The police had backup from the army.
警方得到了军方的增援。
来自《权威词典》
3 . She once sang backup for Madonna.
她曾经为麦当娜伴唱.
来自《简明英汉词典》
4 . Have you kept a backup of this file?
你把这文件备份了 吗 ?
来自《简明英汉词典》
5 . File in the target drived : BACKUP directory will be erased strike any key when ready.
目标驱动器标 d: BACKUP目录 内的文件将被删除,准备好后按任意键继续.
来自互联网
1.an accumulation caused by clogging or a stoppage;
a traffic backup on the main street
2.someone who takes the place of another (as when things get dangerous or difficult);
the star had a stand-in for dangerous scenes
3.a subordinate musical part; provides background for more important parts
4.(computer science) a copy of a file or directory on a separate storage device;
he made a backup in case the original was accidentally damaged or erased
5.the act of providing approval and support;
his vigorous backing of the conservatives got him in trouble with progressives