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碳—氮 |
carbon -nitrogen : 41 phrases in 14 subjects |
Agriculture | 5 |
Automobiles | 1 |
Aviation | 2 |
Chemistry | 2 |
Desert science | 3 |
Earth sciences | 5 |
Ecology | 4 |
Geology | 3 |
Metallurgy | 1 |
Oil / petroleum | 2 |
Oil processing plants | 1 |
Space | 2 |
Technology | 9 |
Water resources | 1 |