Ключевые слова: african, coal, construction, dirt, dirty, driving, dust, employee, energy, engine, engineer, engineering, equipment, factory, foreman, fossil, geology, gold, heavy, helmet, horizontal, industry, job, large, laughing, machine, machinery, man, manager, manufacturing, mine, mineral, occupation, oil, open, professional, quality, resource, responsibility, safety, skilled, tablet, technology, truck, wheel, worker, working, yellow,