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21. | maintaining field |
| 维持场 |
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22. | sustain an institution |
| 维持公共设施 |
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23. | holding current |
| 维持电流 |
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24. | maintenance of social order |
| 维持社会秩序 |
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25. | maintaining stimulus |
| 维持刺激 |
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26. | methadone maintenance |
| 美沙酮维持 |
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27. | Maintenance stage |
| 维持阶段 |
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28. | maintenance of assets |
| 资产维持 |
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29. | preserving duty |
| 维持关税 |
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30. | maintenance of soil fertility |
| 维持土壤肥力 |
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