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| 干线; 正轨; 主线路 | |||
| 主要轨道; 主线; 主航线; 正线【铁】; 铁路干线; 主干线; 正线 | |||
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main track : 14 phrases in 6 subjects |
| Air defense | 1 |
| Bridge construction | 3 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Space | 1 |
| Technology | 7 |
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