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A helicopter takes part in a comprehensive rescue exercise 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)
A helicopter takes part in a comprehensive rescue exercise 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)