Cellphone photo taken on June 11, 2019 shows prayer flags on a mountain in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on May 20, 2019 shows the scenery of Norbulingka Park in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on June 17, 2019 shows the scenery of the Potala Palace in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on April 23, 2019 shows a resident walking dogs in the morning in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on June 2, 2019 shows a view of solar halo over Lhasa, southwest China's Tibet Autonomous Region. (Photos: Xinhua)

Cellphone photo taken on May 29, 2019 shows a restaurant table with the Potala Palace in the background in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on May 3, 2019 shows a worker preparing Tibetan noodles at a Tibetan restaurant in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on April 28, 2019 shows a rock band of the Tibetan ethnic group performing at a bar in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on May 24, 2019 shows the Potala Palace with a snow mountain in the background in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on May 14, 2019 shows a worker walking down a ladder at a temple in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on April 30, 2019 shows the golden roofs of the Jokhang Temple in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on June 4, 2019 shows the Potala Palace during sunset in Lhasa, southwest China's Tibet Autonomous Region.

Cellphone photo taken on June 16, 2019 shows a Khampa Tibetan man sitting at a park in Lhasa, southwest China's Tibet Autonomous Region.