Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)

Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)

Local people spin prayer wheels for blessings at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province, July 20, 2013. (Xinhua/Luo Xiaoguang)

Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)

Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)

Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)

Photo taken on July 20, 2013 shows the scenery of grassland at Maqu county in Tibetan Autonomous Prefecture of Gannan, Northwest China's Gansu Province. (Xinhua/Luo Xiaoguang)