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31. | Maintenance stage |
| 维持阶段 |
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32. | last out; sustain |
| 维持到底 |
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33. | to earn one's bread |
| 维持生活 |
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34. | methadone maintenance |
| 美沙酮维持 |
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35. | To maintain peace |
| 维持治安 |
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36. | maintaining stimulus |
| 维持刺激 |
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37. | sustain an institution |
| 维持公共设施 |
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38. | preserving duty |
| 维持关税 |
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39. | holding current |
| 维持电流 |
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40. | maintaining field |
| 维持场 |
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