| 释义 |
back·upBrE /ˈbækʌp/ NAmE /ˈbækʌp/ noun [U , C ]extra help or support that you can get if necessary 增援；后援◆ 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(computing计算机) a copy of a file , etc . that can be used if the original is lost or damaged （文件等的）备份◆ Always make a backup of your work . 所有文件都须备份。◆ a backup copy 备份文件 ➡ see also back sth↔up at backverb |