| 释义 |
ˌback ˈup|ˌback sth↔ˈupto move backwards, especially in a vehicle后退；倒（车）You can back up another two feet or so.你可以再退两英尺左右。I backed the car up to the door.我把车倒到门前。ˌback sth↔ˈup(computing计)to prepare a second copy of a file, program, etc. that can be used if the main one fails or needs extra support给（文件、程序等）做备份；备份related nounbackup (2) |