back up
phrasal verbback up | back something up
- 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。 - Can you back your car up so that I can get through?
你能不能把车倒一下让我过去？
- You can back up another two feet or so.
back somebody/something up
- to support somebody/something; to say that what somebody says, etc. is true
支持；证实（某人所言） - I'll back you up if they don't believe you.
如果他们不相信你，我会为你作证。 - The writer doesn't back up his opinions with examples.
作者没用实例印证他的看法。
- I'll back you up if they don't believe you.
- to provide support for somebody/something
支持；支援 - two doctors backed up by a team of nurses
由一组护士辅助的两名医生 - The rebels backed up their demands with threats.
反叛者以恐吓手段要挟。
- two doctors backed up by a team of nurses
back something up
- (computing) 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 - It's a good idea to back up your files onto a memory stick.
将文件备份到记忆棒上是个好主意。
- It's a good idea to back up your files onto a memory stick.