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| 机螺栓: 63 phrases in 14 subjects |
| Architecture | 3 |
| Automobiles | 4 |
| Aviation | 1 |
| Electric machinery | 4 |
| Electronics | 1 |
| General | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 5 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Rail transport | 3 |
| Shipbuilding | 8 |
| Space | 3 |
| Technology | 27 |
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