Ключевые слова: bridge, car, city, cityscape, day, douro, electric, electricity, environmental, europe, journey, light, luis, metro, modern, people, porto, portugal, portuguese, public, rail, railroad, railway, river, road, sky, station, stop, street, streetcar, subway, summer, technology, train, tram, tramway, transport, transportation, travel, trolley, tunnel, urban, vehicle, vehicles, yelllow, yellow,