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| 21. | Straighten your back (up)! |
| 把背挺直! |
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| 22. | port back-up land |
| 港口后勤用地 |
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| 23. | back-up circuit breaker |
| 备用电路断路器 |
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| 24. | edit back-up command |
| 编辑备用命令 |
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| 25. | back-up overspeed governor |
| 备用超速保安器 |
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| 26. | back up water level |
| 回升水位 |
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| 27. | provisional back-up value |
| 候选返上值 |
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| 28. | get someone's Back up |
| 惹恼某人 |
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| 29. | metal back-up thimble |
| 金属座圈 |
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| 30. | interlocked back-up ring |
| 联锁支撑环 |
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