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主动系 统 : 39 phrases in 9 subjects |
| Astronautics | 3 |
| Automobiles | 1 |
| Aviation | 1 |
| General | 10 |
| Loading equipment | 1 |
| Military | 3 |
| Nautical | 1 |
| Space | 1 |
| Technology | 18 |
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