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Elementary school students visit a planetarium in Lhasa, southwest China's Tibet Autonomous Region, Dec. 14, 2019. An planetarium opened its door to the public for trial operation in Lhasa on Saturday. (Xinhua/Li Xin)
Elementary school students visit a planetarium in Lhasa, southwest China's Tibet Autonomous Region, Dec. 14, 2019. An planetarium opened its door to the public for trial operation in Lhasa on Saturday. (Xinhua/Li Xin)