Ключевые слова: aged, blue, building, business, chinese, company, concept, construction, energy, engineer, engineering, environment, equipment, factory, first, fuel, gas, gasoline, gear, global, hat, health, helmet, industrial, industry, looking, man, metal, occupational, outdoors, people, person, petrochemical, petroleum, plant, power, professional, refinery, safety, set, site, standard, steel, table, technology, white, work, worker, young,