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| nitrogen level | |||
| nitrogen content | |||
| nitrogenous content | |||
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含 氮 量 : 31 phrases in 13 subjects |
| Agriculture | 4 |
| Animal husbandry | 4 |
| Ecology | 4 |
| Electronics | 1 |
| Environment | 1 |
| Food industry | 1 |
| Food service and catering | 1 |
| General | 3 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 4 |
| Water resources | 3 |
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