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| excess carbon (的) | |||
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富 碳 : 20 phrases in 8 subjects |
| Chemistry | 1 |
| Desert science | 3 |
| Earth sciences | 2 |
| Ecology | 1 |
| General | 3 |
| Metallurgy | 6 |
| Oil / petroleum | 1 |
| Technology | 3 |
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