Visitors appreciate cultural relics of the Kingdom of Xia on display in an exhibition in Changchun, capital of Northeast China's Jilin Province, May 15, 2013. An exhibition of the cultural relics of the Kingdom of Xia, a regime founded in west China in 1038, was held here on Wednesday, in which more than 100 cultural relics of the kingdom excavated since the founding of the People's Republic of China in 1949 were shown to the public. (Xinhua/Xu Chang)

Visitors appreciate cultural relics of the Kingdom of Xia on display in an exhibition in Changchun, capital of Northeast China's Jilin Province, May 15, 2013. An exhibition of the cultural relics of the Kingdom of Xia, a regime founded in west China in 1038, was held here on Wednesday, in which more than 100 cultural relics of the kingdom excavated since the founding of the People's Republic of China in 1949 were shown to the public. (Xinhua/Xu Chang) 

Photo taken on May 15, 2013 shows cultural relics of the Kingdom of Xia on display in an exhibiton in Changchun, capital of Northeast China's Jilin Province. An exhibition of the cultural relics of the Kingdom of Xia, a regime founded in west China in 1038, was held here on Wednesday, in which more than 100 cultural relics of the kingdom excavated since the founding of the People's Republic of China in 1949 were shown to the public. (Xinhua/Xu Chang) 

Visitors appreciate cultural relics of the Kingdom of Xia on display in an exhibition in Changchun, capital of Northeast China's Jilin Province, May 15, 2013. An exhibition of the cultural relics of the Kingdom of Xia, a regime founded in west China in 1038, was held here on Wednesday, in which more than 100 cultural relics of the kingdom excavated since the founding of the People's Republic of China in 1949 were shown to the public. (Xinhua/Xu Chang)