Ключевые слова: ampoule bridge, ancient architecture, build, building, built on, characteristic, chengdu, china, cultural relics, culture, detached park, dujiangyan, dujiangyan city, effect, flood control, garden, history, hydraulic engineering, irrigation, national, national level, oldest, plant, protection, river, scenic area, sichuan province, tourist attractions, trees, two thousand years, water supply without dam, world natural heritage, worldwide, yuleishan park,