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Conservators of the Potala Palace make digital registration of the ancient documents in Lhasa, capital of southwest China's Tibet Autonomous Region, March 4, 2019. (Xinhua/Purbu Zhaxi)

Conservators of the Potala Palace make digital registration of the ancient documents in Lhasa, capital of southwest China's Tibet Autonomous Region, March 4, 2019. (Xinhua/Purbu Zhaxi)