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| 排水管 (duct pipe) | |||
| 排水管 | |||
| 排水管道 | |||
| 排水渠 (道); 排水管 (道); 排水渠道 | |||
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drainage conduit : 2 phrases in 2 subjects |
| Engineering geology | 1 |
| Technology | 1 |
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