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化学燃料 : 30 phrases in 12 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Bioenergy | 1 |
| Business | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Metallurgy | 2 |
| Shipbuilding | 3 |
| Space | 8 |
| Technology | 7 |
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