Ключевые слова: airport, architecture, automatic, background, building, business, city, construct, design, electric, elevator, empty, entrance, escalate, escalator, escalators, floor, indoor, industry, inside, interior, lift, light, mall, market, metal, metro, modern, move, office, perspective, public, shopping, stair, staircase, stairs, stairway, station, steel, step, subway, technology, transport, underground, up, upwards, urban, walk,