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空心 线 : 37 phrases in 12 subjects |
| Architecture | 1 |
| Astronautics | 1 |
| Aviation | 1 |
| Electric machinery | 9 |
| Electronics | 4 |
| General | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Shipbuilding | 2 |
| Technology | 14 |
| Telecommunications | 1 |
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