Ключевые слова: 30s, building, caucasian, clear, clipboard, communication, concentration, construction, contractor, conversation, daytime, engineer, engineering, examining, factory, forehead, handsome, hat, helmet, industry, men, midadult, occupations, outdoor, outdoors, people, person, pointing, professional, protection, protective, safety, site, steel, twopeople, view, worker, workers, working, years,