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| 地下河 (流) | |||
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stream subterranean : 10 phrases in 6 subjects |
| Desert science | 1 |
| Ecology | 1 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
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