Ключевые слова: aqueduct, brown, central, cleanup, construction, corrosion, day, dirt, engineering, equipment, europe, gas, grass, green, hot, industrial, industry, infrastructure, large, line, material, metal, nature, no people, oil, old, outdoors, pipe, pipeline, piping, plumbing, poland, problems, protection, repair, rust, rusty, sky, steel, sunlight, supply, support, system, transmission, transport, transportation, tube, two, urban, water,