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控制 方位 : 28 phrases in 12 subjects |
| Agriculture | 1 |
| Air defense | 4 |
| Animal husbandry | 1 |
| Drilling | 2 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 3 |
| Military | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 3 |
| Technology | 7 |
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