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Dujiangyanistheoldestman-madewatersystemintheworld,anda...
问题详情:Dujiangyanistheoldestman-madewatersystemintheworld,andawonderinthedevelopmentofChinesescience.Builtover2,200yearsagoinwhatisnowSichuanProvinceinSouthwestChina,thisamazingengineeringachievement...