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back up 英 [bæk ʌp] 　美 [bæk ʌp]

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back up

v. 支持，援助；（资料）备份；倒退；裱；堵车　

You should back up your data often.　你应该经常备份你的数据。

Actually, let me back up and do this in video.　实际上，让我们倒退下然后在录像里做这个。

Backup is what someone gives when they help or support you. A brand new doctor might need some backup in the emergency room for the first few weeks.

1. You should back up your data often.

你应该经常备份你的数据。
2. Actually, let me back up and do this in video.

实际上，让我们倒退下然后在录像里做这个。
3. Whatever you say, he/she can find 10 different reasons to back up his/her viewpoint.

不管你说什么，他/她总是能找出10条不同理由来支持他/她的观点。

back up (v.) 1767, "stand behind and support," from back (v.) + up (adv.). Meaning "move or force backward" is by 1834. Of water prevented from flowing, by 1837.

ˌback ˈup|ˌback sth↔ˈup

to 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。