Ключевые слова: background, barrage, big, blue, clean, cloud, concrete, copy, dam, day, electric, electricity, energy, engineering, environment, facility, flood, focus, generation, green, hokkaido, huge, hydroelectric, hydropower, industry, inland, landscape, line, lock, main, mountain, nature, pipe, plant, power, pump, river, road, sea, shipping, shore, sky, station, steel, stream, summer, technology, water, waterway, weir,