Photo taken on Feb. 21, 2013 from airplane shows aerial view of the west China's Qinghai-Tibet Plateau. (Xinhua/Lian Zhenxiang) 

Photo taken on Feb. 21, 2013 from airplane shows aerial view of the west China's Qinghai-Tibet Plateau. (Xinhua/Lian Zhenxiang) 

Photo taken on Feb. 21, 2013 from airplane shows aerial view of the west China's Qinghai-Tibet Plateau. (Xinhua/Lian Zhenxiang) 

Photo taken on Feb. 21, 2013 from airplane shows aerial view of the west China's Qinghai-Tibet Plateau. (Xinhua/Lian Zhenxiang) 

Photo taken on Feb. 21, 2013 from airplane shows aerial view of the west China's Qinghai-Tibet Plateau. (Xinhua/Lian Zhenxiang)