obstruction: 94 phrases in 21 subjects |
British usage, not spelling | 1 |
Coal | 1 |
Communications | 5 |
Construction | 4 |
Economy | 2 |
Electronics | 2 |
Energy industry | 1 |
Environment | 1 |
General | 11 |
Health care | 2 |
Law | 1 |
Life sciences | 1 |
Mechanic engineering | 3 |
Medical | 33 |
Military | 1 |
Optics branch of physics | 2 |
Paleontology | 1 |
Physics | 1 |
Technology | 3 |
Transport | 17 |
Weapons and gunsmithing | 1 |