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被 动 系统 : 58 phrases in 13 subjects |
| Air defense | 1 |
| Automobiles | 8 |
| Aviation | 4 |
| Computer networks | 1 |
| Ecology | 1 |
| Electronics | 5 |
| General | 2 |
| Nautical | 2 |
| Rail transport | 1 |
| Solar power | 1 |
| Space | 21 |
| Sports | 2 |
| Technology | 9 |
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