Ключевые слова: aqueduct, blurred, central, central heating, communication, conducting, conduit, duct, energy, equipment, heating, heating main, hot, hydropower, industry, infrastructure, insulation, large, line, main, metal, municipal, old, outdoor, outside, pipe, pipeline, plumbing, selective focus, snow, steam, steel, stream, structure, supply, system, technology, thermal, transfer, transit, transmission, transporting, trunk, tubing, urban, water, water supply, winter,