A worker builds a landslide dam in Zhouqu County, northwest China's Gansu Province, Aug. 6, 2011. A total of 15 concrete-made dams are under construction here as a move to avoid deadly landslide. The mudslide devastation on Aug. 8, 2010 left more than 1,700 people dead or missing in the county. (Xinhua/Zhang Meng)
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