Photo taken on March 29, 2018 shows flowers blooming in Lhasa, capital of southwest China`s Tibet Autonomous Region. (Xinhua/Yexe Dainzin)

Photo taken on May 19, 2015 shows a Tibetan antelope in Hoh Xil, northwest China`s Qinghai Province.(Xinhua/Wu Gang)

Photo taken on Oct. 24, 2014 shows wild yaks walking on the border of the Kum Kol Desert in Altun Mountain National Nature Reserve in northwest China`s Xinjiang Uygur Autonomous Region. (Xinhua/Jiang Wenyao)

Photo taken on Nov. 23, 2017 shows the Lalu wetland in Lhasa, capital of southwest China`s Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on June 21, 2017 shows the scenery in Gannan Tibetan Autonomous Prefecture, northwest China`s Gansu Province. (Xinhua/Chen Bin)

Photo taken on Jan. 6, 2018 shows red deers at an artificial forest in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

Photo taken on March 31, 2018 shows peach flowers blooming at a village in Nyingchi City, southwest China`s Tibet Autonomous Region.(Xinhua/Zhang Rufeng)

Photo taken on Nov. 19, 2016 shows lake and lawn on a high mountain in Shangri-la City of Deqen Tibetan Autonomous Prefecture, southwest China`s Yunnan Province. (Xinhua/Hu Chao)

Photo taken on May 17, 2017 shows villagers diverting water to a wetland in Tingri County of Xigaze, southwest China`s Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on March 11, 2018 shows salt fields in Mangkam County of Qamdo City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on June 26, 2017 shows an aerial view of Tangra Yumco Lake in Nagqu, southwest China`s Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)

Photo taken on Oct. 31, 2017 shows a primeval forest in Lhunze County of Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Aug. 5, 2017 shows flowers blooming on a grassland in Garze Tibetan Autonomous Prefecture, southwest China`s Sichuan Province.(Xinhua/Jiang Hongjing)

Photo taken on July 7, 2017 shows villagers praying for harvest in a field during a festival in Lhunze County, southwest China`s Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)