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| oxygen demand | |||
| 氧需 要: 9 phrases in 8 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Ichthyology | 1 |
| Reproductive biology | 1 |
| Technology | 2 |
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