| 词汇 | backup |
| 释义 | backup 1 ENTRIES FOUND: backup (noun) backup /ˈbækˌʌp/ noun plural backups backup /ˈbækˌʌp/ noun plural backups Learner's definition of BACKUP 1 a [count] : a person or thing that can be used to replace or support another person or thing后备人员；备用物品 His role on the team is to be a backup to the regular quarterback.他是球队主力四分卫的替补。 We have an extra radio as a backup in case this one doesn't work.我们有一台备用收音机，以防这台出问题。 — often used before another noun常用于另一名词前 a backup quarterback替补四分卫 We need a backup plan in case of emergency.我们要有一个应急预案。 b [noncount] : help or support provided by additional people or things增援；支援；后援 The policeman called for backup [=called for other police to come and help him] because the suspect was carrying a gun.由于嫌犯手里有枪，警察请求增援。 We have an extra radio for backup.我们还有一台备用收音机。 He provides backup for the regular quarterback.他担任主力四分卫的替补。 2 [count] US : a situation in which the flow of something (such as traffic) becomes blocked（交通等）堵塞，不畅 There was a traffic backup [=(Brit) tailback] for miles on the road because of the accident.受事故影响，拥堵在路上的车辆长达数英里。 There was a backup [=blockage] in the drain.下水道堵了。 3 [noncount] : a musical part that is sung to support the main singer伴唱；伴奏 She sang backup on his CD.她在他的唱片里伴唱。 — often used before another noun 常用于另一名词前 a backup singer 伴唱歌手 4 [count] : a copy of information stored on a computer（资料的）备份 Be sure to make a backup of your work.一定要把你的文件做个备份。 — often used before another noun 常用于另一名词前 a backup file/copy 备份文件； also : the act or process of making such a copy备份（过程） It may take some time for the backup to be complete.完成备份可能需要点时间。 — see also back up at 4back |
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