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Visitors take boats by the feet of the Potala Palace in Longwangtan Park in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 14, 2019. (Xinhua/Zhang Rufeng)

Visitors take boats by the feet of the Potala Palace in Longwangtan Park in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 14, 2019. (Xinhua/Zhang Rufeng)