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In Chinese history, Tuoshan Weir, located in Ning County of Ningbo, Zhejiang Province, Eastern China, is ranked as one of the four most outstanding hydrological projects ever undertaken. Since the weir was originally constructed during the Tang Dynasty in 833 a.d., it has succeeded for 1171 years in playing a distinctive role in preventing saline water of the East Sea from backing up, conserving freshwater,...
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