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有效 达 : 26 phrases in 12 subjects |
| Advertising | 1 |
| Air defense | 3 |
| Aviation | 2 |
| Commerce | 1 |
| Communications | 1 |
| Drilling | 2 |
| Economy | 3 |
| Electronics | 2 |
| General | 5 |
| Space | 1 |
| Technology | 4 |
| Transport | 1 |
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