| 单词 | back up |
| 释义 | 1. They couldn't understand, so he backed up and told them once more. back a car up 2. 3. Armoured cars backed the infantry up. 4. Figures backed this up. 5. The lectures are to be backed up by a heavy programme of field work. 6. The river was backed up by the spring freshets. Clogged pipes caused drain water to 7. The correspondence has been backing up for several days. The port was backed up. Cars (were) 8. 9. 10. |
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