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| 气段; 空气区域; 航空部 | |||
| air section: 18 phrases in 9 subjects |
| Automobiles | 3 |
| Aviation | 4 |
| Construction | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| General | 1 |
| Steel production | 1 |
| Technology | 5 |
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