back up ( backing, backed, backs )

• 1. 

  PHRASAL VERB If someone or something backs up a statement, they supply evidence to suggest that it is true. 证实

  例：

  Radio signals received from the galaxy's centre back up the black hole theory.

  从该星系中心接收到的无线电信号证实了黑洞理论。

• 2. 

  PHRASAL VERB If you back up a computer file, you make a copy of it that you can use if the original file is damaged or lost. 备份 [计算机]

  例：

  Make a point of backing up your files at regular intervals.

  要特别注意定期备份你的文档。

• 3. 

  PHRASAL VERB If an idea or intention is backed up by action, action is taken to support or confirm it. (以行动) 支持

  例：

  The secretary general says the declaration must now be backed up by concrete and effective actions.

  秘书长说现在必须以具体有效的行动来支持这个宣言。

• 4. 

  PHRASAL VERB If you back someone up, you show your support for them. 支持 (某人)

  例：

  His employers backed him up.

  他的雇主们支持了他。

• 5. 

  PHRASAL VERB If you back someone up, you help them by confirming that what they are saying is true. 证实…的话

  例：

  The girl denied being there, and the man backed her up.

  这女孩否认去过那儿，并且这位男子证实了她的话。

• 6. 

  PHRASAL VERB If you back up, the car or other vehicle that you are driving moves back a short distance. 倒车

  例：

  Back up, Hans.

  倒车，汉斯。

• 7. 

  PHRASAL VERB If you back up, you move backward a short distance. 后退 (一小段距离)

  例：

  I backed up carefully until I felt the wall against my back.

  我小心翼翼地后退了几步，直到感觉到后背贴上了墙。

• 8. 

  PHRASAL VERB When a car backs up or when you back it up, the car is driven backward. (车) 向后倒; 倒 (车) [美国英语]

• 9. 

  → see also backup