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序列系统 : 17 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 3 |
| Electronics | 2 |
| Engineering geology | 1 |
| Management | 1 |
| Plastic surgery | 1 |
| Space | 3 |
| Technology | 2 |
| Transport | 1 |
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