Ключевые слова: autumn, background, beautiful, beauty, blue, china, clean, colorful, countryside, crystal, ecology, emerald, environmental conservation, fall, flowing, foliage, forest, fresh, green, japan, jiuzhaigou, jiuzhaigou national park, lake, landscape, mirror lake, mountain, national, national park, natural, natural parkland, nature, outdoor, paradise, park, pond, reflection, river, sapphire, scenery, scenic, serene, sichuan, sky, stream, tourism, tourist, tranquil scene, travel, travel destinations, tree, turquoise, unesco world heritage site, valley, water, waterfall, wood,