 |
| 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 |