Ключевые слова: background, blue, bolt, burner, business, cheap, closeup, company, construction, cooling, dangerous, expensive, facility, factory, flame, flow, gas, hard, hardening, hazard, heated, hot, iron, job, melt, metal, process, production, products, profit, red, spring, stainless, steel, technology, tools, torch, unhealthy, work, worker, working,