冰 期 : 311 phrases in 17 subjects |
Agriculture | 8 |
Aviation | 6 |
Construction | 1 |
Desert science | 50 |
Earth sciences | 24 |
Ecology | 4 |
Economy | 2 |
Engineering geology | 16 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 19 |
Geology | 8 |
Hydroelectric power stations | 6 |
International trade | 1 |
Oil / petroleum | 56 |
Refrigeration | 1 |
Space | 1 |
Technology | 107 |