Waterwheel Park in Lanzhou

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Photo taken on April 17 shows the Waterwheel Park in Lanzhou City, capital of Gansu Province. The Lanzhou Waterwheel, an irrigation tool with a history of nearly 5,000 years, is dubbed “a public water instrument of ancient times.” Invented in 1556 by Duan Xu, a local official, the ancient device uses flowing or falling water to create power through paddles mounted around a wheel. The waterwheel, featuring advanced technology, low costs and a strong visual effect, greatly promoted the agricultural and social development in Lanzhou at that time. [Photo/Gscn.com.cn]

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