◆ back up倒退( to move back wards) ◆‘Don' t shoot!' he said and backed ◆别开枪!”他说着往后退 You missed the lines in the parking space You ll have to back up and try again ◆支持( to confirm a story, facts or information) A. The new evidence backed up my argument 新的证词有助于我的辩论 ◆备份 When my computer crashed. I lost many of my files. It's a good thing i backed them ul back up 倒退(to move backwards)  ‘Don't shoot!’ he said and backed up.  “别开枪！” 他说着往后退。  You missed the lines in the parking space. You’ll have to back up and try again.  支持(to confirm a story, facts or information)  The new evidence backed up my argument.  新的证词有助于我的辩论。  备份  When my computer crashed. I lost many of my files. It’s a good thing I backed them up