backup基本解释
n,支持；[计]后援；阻塞,同近
backup相关例句和用法There is no emergency back-up immediately available..没有立即就能获得的后备。
backup英英释义支持；后援；阻塞英释中释nBackup consists of extra equipment, resources, or people that you can get help or support from if necessary
backup短语backup and recovery,备份与恢复.短语
