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A conservator of the Potala Palace registers an ancient document in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 16, 2018. (Xinhua/Purbu Zhaxi)

A conservator of the Potala Palace registers an ancient document in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 16, 2018. (Xinhua/Purbu Zhaxi)