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)

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)