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| 自然排水 (系统) | |||
| 自然排水 | |||
| 天然排泄〔排水〕 | |||
| 天然排水; 自然排水系统 | |||
| 自然排泄; 自然排液 | |||
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natural drainage : 8 phrases in 7 subjects |
| Chemistry | 1 |
| Desert science | 1 |
| Economy | 1 |
| Environment | 1 |
| Hydraulics | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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