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换转机构 : 22 phrases in 10 subjects |
| Aviation | 1 |
| Business | 1 |
| Drilling | 2 |
| Electronics | 1 |
| General | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Space | 3 |
| Technology | 7 |
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