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| bull-head rail; bull-headed rail; double head rail | |||
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双头轨 : 17 phrases in 8 subjects |
| Architecture | 1 |
| Aviation | 2 |
| Construction | 2 |
| General | 1 |
| Metallurgy | 2 |
| Rail transport | 1 |
| Space | 2 |
| Technology | 6 |
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