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间隙子 : 50 phrases in 13 subjects |
| Agriculture | 1 |
| Aviation | 4 |
| Compressors | 2 |
| Economy | 1 |
| Electric machinery | 3 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 27 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Steel production | 4 |
| Technology | 1 |
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