China's Fenglei aerobatic team performs at the opening ceremony of the 4th China International Helicopter Expo in Tianjin, north China, on Sept. 14, 2017. The expo kicked off here on Thursday. (Xinhua/Zhang Yongjin)
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China's Fenglei aerobatic team performs at the opening ceremony of the 4th China International Helicopter Expo in Tianjin, north China, on Sept. 14, 2017. The expo kicked off here on Thursday. (Xinhua/Zhang Yongjin)
