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联结子 : 15 phrases in 10 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Engineering geology | 1 |
| General | 3 |
| Genetics | 1 |
| Technology | 4 |
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