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| natural drainage (系统) | |||
| natural drainage | |||
| natural discharge | |||
| gravity drainage | |||
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自然排水 : 9 phrases in 6 subjects |
| Desert science | 1 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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