空隙 : 221 phrases in 22 subjects |
Astronautics | 1 |
Astronomy | 1 |
Automobiles | 1 |
Aviation | 2 |
Biology | 1 |
Construction | 3 |
Electric machinery | 1 |
Electronics | 37 |
Gear train | 1 |
General | 52 |
Geology | 18 |
Household appliances | 1 |
Hydrology | 1 |
Mechanic engineering | 1 |
Military | 1 |
Mining | 1 |
Nautical | 1 |
Oil / petroleum | 3 |
Oil and gas technology | 1 |
Oil processing plants | 4 |
Photography | 1 |
Technology | 88 |