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| 天然水道; 自然河槽 | |||
| 天然河槽; 天然渠道 | |||
| 天然河道; 天然航道 | |||
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| 天然河槽; 天然河床 | |||
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natural channel : 17 phrases in 6 subjects |
| Agriculture | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Hydraulics | 1 |
| Hydroelectric power stations | 2 |
| Technology | 11 |
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