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J-10 fighter jets of China's Bayi Aerobatic Team perform in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Sky Wing Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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A domestically-built Y-20 heavy transport aircraft is seen during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Red Falcon Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Red Falcon Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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J-10 fighter jets of China's Bayi Aerobatic Team perform in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Sky Wing Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Sky Wing Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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People watch the flight demonstration during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Red Falcon Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)

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The Red Falcon Air Demonstration Team performs in the sky during the Chinese People's Liberation Army (PLA) Air Force Aviation Open Day in Changchun, capital city of northeast China's Jilin Province, Aug. 11, 2017. (Xinhua/Lin Hong)