Pigeons fly over the Potala Palace square in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 10, 2019. (Xinhua/Chogo)

An elderly man spins a prayer wheel at the Potala Palace square in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 10, 2019. (Xinhua/Sun Fei)

Local people dance at a park nearby the Potala Palace in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 10, 2019. (Xinhua/Li Xin)

Photo taken on March 10, 2019 shows the view of a park nearby the Potala Palace in Lhasa, capital city of southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Aerial photo taken on March 10, 2019, shows a view of the Danxia landform in Guide County, the Tibetan Autonomous Prefecture of Hainan, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on March 10, 2019, shows the Qianzi Lake Scenic Area in Guide County, the Tibetan Autonomous Prefecture of Hainan, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on March 10, 2019, shows a boat at the Qianzi Lake Scenic Area in Guide County, the Tibetan Autonomous Prefecture of Hainan, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on March 10, 2019, shows the Yellow River flowing through Guide County, the Tibetan Autonomous Prefecture of Hainan, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Photo taken on March 10, 2019, shows snow mountains in Guide County, the Tibetan Autonomous Prefecture of Hainan, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)