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Visitors view a helicopter during the Aviation Expo China 2017 in Beijing, capital of China, Sept. 19, 2017. The expo is held from Sept. 19 to 22.(Xinhua/Zhang Chenlin)
Visitors view a helicopter during the Aviation Expo China 2017 in Beijing, capital of China, Sept. 19, 2017. The expo is held from Sept. 19 to 22.(Xinhua/Zhang Chenlin)