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生 产物料 : 16 phrases in 10 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Bioenergy | 1 |
| Business | 2 |
| Economy | 4 |
| Energy industry | 1 |
| General | 1 |
| Metallurgy | 1 |
| Statistics | 1 |
| Technology | 2 |
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