backup的意思
noun
1. the act of providing approval and support
e.g. his vigorous backing of the conservatives got him in trouble with progressives
Synonym: backingchampionshippatronage
2. (computer science) a copy of a file or directory on a separate storage device
e.g. he made a backup in case the original was accidentally damaged or erased
Synonym: computer backup
3. a musical part (vocal or instrumental) that supports or provides background for other musical parts
Synonym: accompanimentmusical accompanimentsupport
4. someone who takes the place of another (as when things get dangerous or difficult)
e.g. the star had a stand-in for dangerous scenes
we need extra employees for summer fill-ins
Synonym: stand-insubstitutereliefrelieverbackup manfill-in
5. an accumulation caused by clogging or a stoppage
e.g. a traffic backup on the main street
he discovered a backup in the toilet