A craftsman shows the art of stone carving at an exhibition of Tibetan intangible cultural heritages in Lhasa, southwest China's Tibet Autonomous Region, June 12, 2015. The second exhibition on the protection of Tibetan intangible cultural heritages was held in Lhasa Friday. (Xinhua/Liu Dongjun)

A man views masks at an exhibition of Tibetan intangible cultural heritages in Lhasa, southwest China's Tibet Autonomous Region, June 12, 2015. The second exhibition on the protection of Tibetan intangible cultural heritages was held in Lhasa Friday. (Xinhua/Liu Dongjun)

A woman shows a Tibetan weaving works at an exhibition of Tibetan intangible cultural heritages in Lhasa, southwest China's Tibet Autonomous Region, June 12, 2015. The second exhibition on the protection of Tibetan intangible cultural heritages was held in Lhasa Friday. (Xinhua/Liu Dongjun)

Photo taken on June 12, 2015 shows the scene at an exhibition of Tibetan intangible cultural heritages in Lhasa, southwest China's Tibet Autonomous Region. The second exhibition on the protection of Tibetan intangible cultural heritages was held in Lhasa Friday. (Xinhua/Liu Dongjun)

A craftsman shows the block printing art of Tibetan language at an exhibition of Tibetan intangible cultural heritages in Lhasa, southwest China's Tibet Autonomous Region, June 12, 2015. The second exhibition on the protection of Tibetan intangible cultural heritages was held in Lhasa Friday. (Xinhua/Liu Dongjun)