Ключевые слова: blue, building, business, caucasian, chemical, chemistry, construction, employees, engineer, engineering, environment, equipment, factory, fuel, gas, gasoline, group, helmet, industrial, industry, job, machine, maintenance, male, man, manufacture, manufacturing, mechanical, occupation, oil, operator, person, petrochemical, petrol, petroleum, pipeline, plant, power, production, professional, refinery, safety, sky, steel, teamwork, technology, work, work wear, worker, workman,