地 下管道 : 60 phrases in 14 subjects |
Agriculture | 3 |
Animal husbandry | 1 |
Architecture | 1 |
Bridge construction | 1 |
Business | 1 |
Construction | 1 |
Electronics | 2 |
Engineering geology | 3 |
Hydroelectric power stations | 3 |
Plastics | 1 |
Space | 1 |
Technology | 35 |
Telecommunications | 6 |
Water resources | 1 |