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| NOUN |
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| /ˈbækʌp/ |
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| 1 | 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 |
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| 2 | C computing a copy of information on your computer that you make in case you lose the information 备份 |
| Remember to do regular backups. 记住要定期备份。 |
| a backup copy 备份文件 |
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| 3 | U MAINLY AMERICAN music that is played or sung to add to the main singer’ s voice 伴奏；伴唱 |
| Her sister goes on tour with her and sings backup. 她的妹妹和她一起巡回演出，为她伴唱。 |
| a backup vocalist 伴唱歌手 |
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