Ключевые слова: blue, boiler, building, colors, company, construction, control, electric, electricity, energy, environment, equipment, factory, gas, heat, home, hot, house, industrial, industry, interior, iron, line, machine, machinery, metal, modern, natural, pipe, pipelines, plant, plastic, power, pressure, red, repair, ring, road, service, sky, smoke, steam, steel, technology, vertical, warm, water, work, worker,