Tibetan monks attend an event celebrating the 600th anniversary of the founding of Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 20, 2019. Built in 1419, Sera Monastery is a prestigious monastery of Tibetan Buddhism's Gelug Sect. (Xinhua/Purbu Zhaxi)

A visitor takes a picture during an event celebrating the 600th anniversary of the founding of Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 20, 2019. Built in 1419, Sera Monastery is a prestigious monastery of Tibetan Buddhism's Gelug Sect. (Xinhua/Purbu Zhaxi)

People attend an event celebrating the 600th anniversary of the founding of Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 20, 2019. Built in 1419, Sera Monastery is a prestigious monastery of Tibetan Buddhism's Gelug Sect. (Xinhua/Purbu Zhaxi)

Photo taken on Oct. 20, 2019 shows an event celebrating the 600th anniversary of the founding of Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region. Built in 1419, Sera Monastery is a prestigious monastery of Tibetan Buddhism's Gelug Sect. (Xinhua/Purbu Zhaxi)

Tibetan monks attend an event celebrating the 600th anniversary of the founding of Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 20, 2019. Built in 1419, Sera Monastery is a prestigious monastery of Tibetan Buddhism's Gelug Sect. (Xinhua/Purbu Zhaxi)

Editor: Yurou