back-up

back-up ['bæk'ʌp]  ['bæk'ʌp] 

back-up 基本解释

back-up是什么意思

备份

back-up 相关例句

danci.911cha.com

名词

1. Do you have any back-ups in case I cannot be there?
    假如我不能来,你们有没有候补人员?