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临界深度 : 25 phrases in 10 subjects |
| Agriculture | 1 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Hydraulics | 1 |
| Hydroelectric power stations | 1 |
| Hydrology | 1 |
| Metallurgy | 1 |
| Space | 2 |
| Technology | 13 |
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