Actresses of China's Gansu Opera House perform during a thematic music and dance act of Dunhuang Melody in Lanzhou City, northwest China's Gansu Province, July 6, 2011. Dunhuang is home to more than 800 grottos that are at least 1,600 years old, holding China's largest and richest collection of stone carvings and mural paintings. (Xinhua/Gao Jianjun)
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