平均流量: 142 phrases in 18 subjects |
Architecture | 1 |
Automobiles | 4 |
Aviation | 1 |
Bridge construction | 3 |
Business | 1 |
Desert science | 3 |
Earth sciences | 3 |
Ecology | 3 |
Electronics | 4 |
Engineering geology | 4 |
Hydroelectric power stations | 13 |
Hydrology | 1 |
Oil / petroleum | 1 |
Refrigeration | 2 |
Space | 2 |
Technology | 94 |
Telecommunications | 1 |
Wind Energy | 1 |