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地 下 河: 48 phrases in 10 subjects |
Bridge construction | 1 |
Desert science | 4 |
Earth sciences | 2 |
Ecology | 3 |
Electronics | 1 |
Engineering geology | 8 |
Explosives and Explosive Ordnance Disposal | 1 |
Hydroelectric power stations | 5 |
Life sciences | 1 |
Technology | 22 |