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| 河流自净作用 | |||
| 河流自净机理; 河流自净 (作用) | |||
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| 河流自净能力 | |||
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stream self-purification : 9 phrases in 4 subjects |
| Agriculture | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
| Water resources | 2 |
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