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| 缓燃: 57 phrases in 12 subjects |
| Automobiles | 3 |
| Aviation | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 9 |
| General | 3 |
| Informal | 1 |
| Metallurgy | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 3 |
| Plastics | 2 |
| Space | 10 |
| Technology | 21 |
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