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| 防火 花: 18 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Electronics | 1 |
| General | 2 |
| Nautical | 1 |
| Refrigeration | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 8 |
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