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| 地下暗管 | |||
| 埋管; 埋置的管 | |||
| 埋入式管道 | |||
| 暗装管道 | |||
| 埋藏式管道 | |||
| 埋置管道; 埋藏管道; 暗装管 (道); 暗管; 地下雨水管 | |||
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embedded pipe : 7 phrases in 2 subjects |
| Hydroelectric power stations | 3 |
| Technology | 4 |
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