Hot air balloon event held in China's Ningxia
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People prepare hot air balloons before flying during a test flight at Baijitan national desert park at Lingwu City, northwest China%26#039;s Ningxia Hui Autonomous region, July 30, 2017. The hot air balloon event was open to the public on Monday and 32 hot air balloons from different areas of China took part in the event. [Photo: Xinhua/Sui Xiankai]