Photo taken on April 15, 2013 shows a snow-covered village in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)

Photo taken on April 15, 2013 shows a line of visitors at the foot of a snow mountain in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)

Photo taken on April 15, 2013 shows two cyclers riding along a highway in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)

Photo taken on April 15, 2013 shows a photo amateur shooting for Mount Namcha Barwa in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)

Photo taken on April 15, 2013 shows travellors taking photos of the Mount Namcha Barwa in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)

Photo taken on April 15, 2013 shows a snow mountain in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Wen Tao)