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单词 backup
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 back verb
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