protective covering: 42 phrases in 15 subjects |
Advertising | 1 |
Astronautics | 3 |
Construction | 5 |
Dentistry | 6 |
Ecology | 3 |
Energy industry | 1 |
Geology | 1 |
Makarov | 2 |
Military | 6 |
Mining | 1 |
Missiles | 1 |
Natural resourses and wildlife conservation | 1 |
Occupational health & safety | 6 |
Technology | 4 |
Weapons of mass destruction | 1 |