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backup

美音:[´bæ´kʌp ]点这儿播放单词美音发声
英音:[´bæ´kʌp ]点这儿播放单词英音发声
n.后援,支持,阻塞; vt.做备份; adj.候补的,支持性的

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backup为短语/超纲词汇

backup


n
[C]
something that you can use to replace something that does not work or is lost
 Always have a backup plan.
 a backup generator
[C]
a copy of a computer document, program etc, which is made in case the original becomes lost or damaged
 Make a backup of any work you do on the computer.
[U]
people or things that can be used to provide support and help if they are needed
 Army units can only operate if they have sufficient backup.
 a backup team
[C]AmE
someone who will play in a sports team if one of the other players is injured or ill
= reserve
 a backup goalie