Ключевые слова: above, abstract, aerial, background, barrel, blue, business, chemical, design, down, drone, energy, engineering, environment, equipment, factory, fly, fuel, gas, heavy, hong, industrial, industry, kong, line, manufacturing, metal, oil, over, pipe, pipeline, piping, plant, power, production, refinery, shine, sky, steel, tai po, technology, top, top down, tower, view, worker,