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Photo taken on Oct. 10, 2019 shows the venue of the 5th China Helicopter Exposition in north China's Tianjin. The 5th China Helicopter Exposition runs from Oct. 10 to 13. (Xinhua/Li Ran)
Photo taken on Oct. 10, 2019 shows the venue of the 5th China Helicopter Exposition in north China's Tianjin. The 5th China Helicopter Exposition runs from Oct. 10 to 13. (Xinhua/Li Ran)