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燃 烧 面面积 : 22 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 6 |
| Aviation | 2 |
| Electric machinery | 1 |
| Shipbuilding | 2 |
| Space | 7 |
| Technology | 1 |
| Textile industry | 1 |
| Transport | 1 |
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