Ключевые слова: blue, building, business, chemical, chemistry, colors, construction, dusk, education, energy, engineer, engineering, environment, equipment, export, factory, fuel, gas, gasoline, heavy, industrial, industry, intelligence, job, machine, manufacturing, metal, night, occupation, oil, petrochemical, pipe, pipeline, plant, power, pressure, production, professional, pump, refinery, sky, smoke, steel, supply, technology, textile, tower, tube, twilight, worker,