A worker paints the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Jigme Dorji)

Workers paint the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Sun Fei)

A worker paints the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Purbu Zhaxi)

Workers paint the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Jigme Dorji)

A worker paints the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Purbu Zhaxi)

A worker paints the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 27, 2020. (Xinhua/Chogo)

A worker paints the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 27, 2020. (Xinhua/Chogo)

Workers paint the wall of the Potala Palace during an annual renovation of the ancient architectural complex in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 28, 2020. (Xinhua/Sun Fei)