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| 31. | sewage treatment plant |
| 污水处理场 |
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| 32. | sewage treatment |
| 污水清化 |
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| 33. | sewer ordinance |
| 污水管理条例 |
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| 34. | standard sewage |
| 标准污水 |
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| 35. | Outlet of Sewer |
| 污水出口 |
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| 36. | sewage transportatio |
| 污水运送 |
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| 37. | polluted industrial wastewater |
| 生产污水 |
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| 38. | sewerage filter |
| 污水滤池 |
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| 39. | sewage catchment area |
| 污水集水区 |
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| 40. | sewage fungi |
| 污水真菌 |
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