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| 地下管线; 埋地线; 地下线路; 地下铁路线; 地铁线路; 地下管道 | |||
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underground line : 8 phrases in 5 subjects |
| Agriculture | 1 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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