backup

美 [ˈbækˌʌp]
英 [ˈbækʌp]
  • n.后援;增援;(文件等的)备份
  • adj.后补的;支持性的;伴奏的
  • 网络备份文件;备份成功;后备
复数:backups  
backup
n.
1.
增援;后援extra help or support that you can get if necessary
The police had backup from the army.
警方得到了军方的增援。
We can use him as a backup if one of the other players drops out.
如果有参赛者退出,我们可以用他作为替补。
a backup power supply
备用电源
2.
(文件等的)备份a copy of a file, etc. that can be used if the original is lost or damaged
Always make a backup of your work.
所有文件都须备份。
a backup copy
备份文件

例句

释义:
类别:全部全部,口语口语,书面语书面语,标题标题,技术技术
来源:全部全部,字典字典,网络网络
难度:全部全部,简单简单,中等中等,