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索距 : 60 phrases in 13 subjects |
| Agriculture | 3 |
| Air defense | 10 |
| Automobiles | 2 |
| Aviation | 7 |
| Earth sciences | 2 |
| Electronics | 9 |
| General | 5 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Psychology | 1 |
| Space | 6 |
| Technology | 12 |
| Wind Energy | 1 |
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