Ключевые слова: background, build, building, business, concrete, construction, digger, digging, dirty, district, drain, drainage, engineering, equipment, excavation, gas, ground, heating, heavy, industrial, industry, installing, large, line, manufacturing, metal, north, oil, outside, pipe, pipeline, pipes, piping, plant, rack, repair, road, sewage, sewer, site, stream, street, system, technology, trench, tube, underground, utilities, work, works,