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1. | back up protection |
| 备用保护装置 |
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2. | Back-up schedule |
| 后备计划 |
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3. | Back-up source |
| 后备电源 |
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4. | "Back up, son ! " |
| 振作起来,孩子! |
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5. | back-up attachment |
| 背钳附件 |
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6. | Back up lighting |
| 备用照明 |
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7. | back-up programmer |
| 后备编程器 |
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8. | back-up galvanometer |
| 辅助检流计 |
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9. | back-up services |
| 善后服务 |
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10. | archival back-up |
| 归档备份 |
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