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地面排水沟 |
area drainage : 51 phrases in 12 subjects |
Bridge construction | 2 |
Desert science | 3 |
Drilling | 1 |
Earth sciences | 1 |
Ecology | 1 |
Electronics | 2 |
Engineering geology | 3 |
Hydroelectric power stations | 11 |
Mining | 1 |
Oil / petroleum | 4 |
Technology | 20 |
Water resources | 2 |