clamshells: 43 phrases in 17 subjects |
Automobiles | 1 |
Aviation | 5 |
Caspian | 1 |
Cement | 1 |
Construction | 4 |
Electronics | 2 |
General | 1 |
Geology | 1 |
Medical | 2 |
Mining | 9 |
Nanotechnology | 1 |
Oil / petroleum | 1 |
Rail transport | 3 |
Road works | 1 |
Sports | 1 |
Technology | 8 |
Thermal engineering | 1 |