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| 51. | maintenance of soil fertility |
| 维持土壤肥力 |
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| 52. | Maintenance stage |
| 维持阶段 |
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| 53. | preserving duty |
| 维持关税 |
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| 54. | To conduct; maintain. |
| 开展；维持. |
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| 55. | methadone maintenance |
| 美沙酮维持 |
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| 56. | maintenance of social order |
| 维持社会秩序 |
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| 57. | maintaining field |
| 维持场 |
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| 58. | maintenance therapy |
| 维持疗法 |
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| 59. | maintenance of assets |
| 资产维持 |
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| 60. | standing charges |
| 维持费用 |
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