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BACk up 意思

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back up, 倒退,可能代表倒车时起作用的电路吧。

back up 英[bæk ʌp] 美[bæk ʌp] vi. 支持; 协防,补防; 堵塞; 复制; 往后退; [例句]Radio signals received from the galaxy's centre back up the black hole theory 从该星系中心收到的无线电信号证实了黑洞理论。

back up 1. (使)后退;倒退回去;倒(车): 例句: He backed up to the loading platform. 他(把车)倒退到装货平台。 2. (使)倒着上: 例句: If you can't drive up the hill forwards, you'll have to back the car up. 假如你不能把轿车正着开...

back off :滚开,后退。比较口语化,用于辱骂等命令语气。 back up:交通堵塞。如traffic backs up around the corner...写作时可用这句,不要用traffic is busy... back up还有倒退之意The economy has been always backing up(off)....经济持...

back up 1.drive or move backwards倒车 *He had to back his car up because the mountain path was too narrow.由于山路太窄,他不得不把车子倒了回来。 2.support 支持 *I hope you will back me up in this argument.我希望在这场争论中...

back-up battery 备用电池 双语例句 1 Your print was found on the battery. 在电池上找到了你的指纹. 2 Main battery at the ready! 主炮准备好了!

两者都有,另外还有back-up。 其中,back up是动词词组,backup和back-up是单词,具体释义上的区别如下: back up v. 支持,援助;(资料)备份;倒退 backup n. 支持;后援;阻塞adj. 支持的;候补的vt. 做备份 back-up n. 备份adj. 作支援的vt...

pick back up 拾回

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