Staff members work on the excavation site of the ruins of an ancient city in Liangzhu Town in Hangzhou, capital of east China's Zhejiang Province, March 18, 2011. Zhejiang archaeological administration Friday introduced the progress in the archaeological study of the Liangzhu ancient city of the New Stone Age, one of China's top ten archaeological discoveries in 2007. (Xinhua/Han Chuanhao)