Ключевые слова: blue, business, chemical, chemistry, construction, energy, engineering, equipment, factory, fuel, gas, gasoline, heavy, illustration, improvement, industrial, industry, iron, line, machine, manufacture, manufacturing, material, metal, metallic, oil, petrochemical, pipe, pipeline, plant, pollution, power, pressure, product, production, profile, pump, refinery, shiny, silver, stack, stainless, steel, stock, storage, structure, system, technology, tube,