回声测深: 156 phrases in 17 subjects |
Agriculture | 1 |
Business | 1 |
Construction | 1 |
Earth sciences | 11 |
Electronics | 2 |
Engineering geology | 6 |
General | 4 |
Hydroelectric power stations | 7 |
Mining | 2 |
Nautical | 3 |
Navigation | 4 |
Oil / petroleum | 7 |
Physical sciences | 1 |
Shipbuilding | 11 |
Space | 2 |
Technology | 89 |
United Nations | 4 |