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21. | maintenance frame |
| 维护帧 |
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22. | program maintenance |
| 程序维护 |
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23. | network maintenance |
| 网络维护 |
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24. | maintenance program |
| 维护程序 |
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25. | heritage preservatio |
| 自然遗产维护 |
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26. | maintenance card |
| 维护卡片 |
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27. | adaptive maintenance |
| 适应性维护 |
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28. | Maintenance Manager |
| 维护经理 |
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29. | address maintenance |
| 地址维护 |
|
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30. | maintenance regulation |
| 维护规则 |
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