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| 环沟氧化法 | |||
| 沟渠氧化; 氧化沟 | |||
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ditch oxidation : 36 phrases in 6 subjects |
| Animal husbandry | 1 |
| Ecology | 4 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 15 |
| Water resources | 14 |
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