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气 压 层 : 18 phrases in 9 subjects |
| Aviation | 2 |
| Drilling | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Polymers | 2 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 5 |
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