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直接火 : 98 phrases in 12 subjects |
| Animal husbandry | 2 |
| Automobiles | 15 |
| Aviation | 3 |
| Chemistry | 6 |
| Forestry | 12 |
| General | 4 |
| Metallurgy | 20 |
| Mining | 1 |
| Oil / petroleum | 3 |
| Technology | 30 |
| Textile industry | 1 |
| Wind Energy | 1 |
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