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| 干线 | |||
| 主要路线; 主要道路; 主路由 | |||
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main route : 6 phrases in 6 subjects |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Shipbuilding | 1 |
| Technology | 1 |
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