A Tibetan Buddhism believer prays in front of the Jokhang Temple in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 3, 2015. The annual Tibetan festival Lhapad Duchen, day to commemorate Buddha's descent from Heaven on Sept. 22 of Tibetan calendar, falls on Tuesday this year. (Xinhua/Chogo)

Tibetan Buddhism believers burn incense on a hill behind the Sera Monastry in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 3, 2015. The annual Tibetan festival Lhapad Duchen, day to commemorate Buddha's descent from Heaven on Sept. 22 of Tibetan calendar, falls on Tuesday this year. (Xinhua/Purbu Zhaxi)

Tibetan Buddhism believers circle the Jokhang Temple on the Porgor (or Barkhor) Street in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 3, 2015. The annual Tibetan festival Lhapad Duchen, day to commemorate Buddha's descent from Heaven on Sept. 22 of Tibetan calendar, falls on Tuesday this year. (Xinhua/Chogo)

Monks debate on Buddhism doctrines at the Sera Monastery in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 3, 2015. The annual Tibetan festival Lhapad Duchen, day to commemorate Buddha's descent from Heaven on Sept. 22 of Tibetan calendar, falls on Tuesday this year. (Xinhua/Purbu Zhaxi)