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| 出泥口; 排污孔; 路面上积有泥水的凹坑 | |||
| 排泥孔; 排渣孔 | |||
| 排泥〔渣，垢〕孔 | |||
| 泥浆钻孔; 出泥孔; 淤泥清理孔 | |||
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mud hole : 8 phrases in 3 subjects |
| Drilling | 4 |
| Oil / petroleum | 2 |
| Technology | 2 |
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