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| 起重机轨距 | |||
| 轨道中心; 轨道中线 | |||
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| 轨道中心线 | |||
| track center: 21 phrases in 7 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Rail transport | 3 |
| Technology | 13 |
| Telecommunications | 1 |
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