Ключевые слова: background, blue, business, car, city, cold, construction, drainage, ecology, energy, environment, equipment, field, flow, forest, frost, gas, ice, industrial, industry, iron, landscape, line, long, metal, natural, nature, oil, pipe, pipeline, piping, power, repair, road, russia, sewage, sky, snow, steel, street, technology, tube, two, underground, utilities, warm, water, white, winter, work,