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[C/U] people or equipment that can be used when extra help is needed 后备人员;支援人员;备用设备 I've got my mother as a backup in case the babysitter cancels. 万一临时保姆来不了,我还有我母亲可以帮忙。
They realized that Sykes was armed, and radioed for backup. 他们意识到赛克斯随身带着武器,便用无线电请求支援。
a backup generator/crew 备用发电机/后备人员
Synonyms and related words
Help: help, contribution, assistance...