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Visitors experience VR (virtual reality) devices during the ongoing 5th China Helicopter Exposition in north China's Tianjin, Oct. 10, 2019. The 5th China Helicopter Exposition runs from Oct. 10 to 13. (Xinhua/Li Ran)
Visitors experience VR (virtual reality) devices during the ongoing 5th China Helicopter Exposition in north China's Tianjin, Oct. 10, 2019. The 5th China Helicopter Exposition runs from Oct. 10 to 13. (Xinhua/Li Ran)