Ключевые слова: air, background, blue, boiler, brick, building, chimney, energy, environment, fix, frost, fuel, global, hat, house, improvement, industry, nature, outdoor, physical, pipe, power, private, roof, rooftop, room, sky, smog, smoke, snow, space, steam, sweep, symbol, technician, technology, top, trail, tube, vapor, vapour, view, warming, white, winter, yellow,