 |
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| 明渠 | |||
| 明沟 | |||
| 阳沟 | |||
| |||
| 明渠; 明沟 | |||
| |||
| 明沟 | |||
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open ditch : 7 phrases in 5 subjects |
| Agriculture | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Technology | 2 |
| Water resources | 1 |
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