Ключевые слова: background, building, chemical, color, construction, economy, engineering, environment, environmental, factory, flow, fuel, gas, global, green, heat, heavy, high, hot, industrial, industry, light, metal, modern, oil, pipe, pipeline, piping, plant, pollution, power, production, pump, refinery, science, station, steam, steel, structure, supply, system, tube, under, underground, water,