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| 农用排水管 | |||
| 农田排水 | |||
| 农业埋管排水 | |||
| 农用排水沟; 农业排水沟; 农业排水管; 农田排水渠; 农田排水 (沟) | |||
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agricultural drain : 6 phrases in 3 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
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