backup /ˈbækʌp/ (also back-up) CET4 TEM4

• 1. 

  N-VAR Backup consists of extra equipment, resources, or people that you can get help or support from if necessary. 后备 (设备、物资或人力)

  例：

  There is no emergency back-up immediately available.

  没有立即就能获得的后备。

• 2. 

  N-VAR If you have something such as a second piece of equipment or set of plans as backup, you have arranged for them to be available for use in case the first one does not work. 备用物 (如设备、计划)

  例：

  Every part of the system has a backup.

  这套系统的每个部分都有备件。

• 3. 

  N-COUNT The backup of a song is the music that is sung or played to accompany the main tune. 伴奏; 伴唱

  例：

  Sharon also sang backup for Barry Manilow.

  莎伦还为巴里·马尼洛唱了伴唱。

• 4. 

  N-COUNT A backup is the same as a . 后援 [美国英语]