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| 堆石排水沟 | |||
| 盲沟; 填石盲沟 | |||
| 块石排水沟; 块石排水 | |||
| 乱石盲沟; 毛石排水沟; 毛石盲沟; 透水石渠; 填石排水沟; 石砌排水沟; 石砌沟渠 | |||
| rubble drain: 6 phrases in 3 subjects |
| Bridge construction | 2 |
| Hydroelectric power stations | 2 |
| Hydrology | 2 |
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