back up 的问题

back up [美] [ˈbækʌp] [英] [ˈbækʌp]

支持
He would have lost his position if you hadn't backed him up. 假如你当初没有支持他,他可能已经失去职位了。
英语字典
back up

If someone or something backs up a statement, they supply evidence to suggest that it is true.
If you back up a computer file, you make a copy of it which you can use if the original file is damaged or lost. Tech:Computing
If an idea or intention is backed up by action, action is taken to support or confirm it.

相关短语
back-up
后援, 滞销货, 贮藏 ... 更多
put sb.'s back up
令某人不快 ... 更多
put/set sb.'s back up
令某人不快 ... 更多
set sb.'s back up
令某人不快 ... 更多

网络翻译
back up
1.策应
2.支持
3.倒退
4.后退
Back up
5.计算机用语 备份

back up当作一个名词使用。所以过去式不变。如He needed some back up 1 hour before.