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放 出气 : 24 phrases in 8 subjects |
| Aviation | 2 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 5 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Space | 1 |
| Technology | 9 |
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