Ключевые слова: africa, african, american, black, building, business, chemical, company, construction, energy, engineer, engineering, environment, factory, fuel, fuel tank, gas, gasoline, gasrefinery, hardhat, helmet, industrial, industry, job, male, man, occupation, oil, oilindustry, oilworker, petrochemical, petrol, pipe, pipeline, plant, power, professional, refinery, safety, site, steel, success, sunset, tank, technician, technology, work, worker,