Staff members inflate a hot air balloon during a hot air balloon festival in Taitung County, southeast China's Taiwan, July 25, 2019. The 45-day hot air balloon festival opened on June 29. (Photos: Xinhua/Wu Lu)

A hot air balloon pilot (2nd R) poses for a group photo with his colleagues during a hot air balloon festival in Taitung County, southeast China's Taiwan, July 25, 2019. The 45-day hot air balloon festival opened on June 29.

A man pilots a hot air balloon during a hot air balloon festival in Taitung County, southeast China's Taiwan, July 25, 2019. The 45-day hot air balloon festival opened on June 29.

Photo taken on July 25, 2019 shows the site of a hot air balloon festival in Taitung County, southeast China's Taiwan. The 45-day hot air balloon festival opened on June 29.

Staff members prepare for the takeoff of a hot air balloon during a hot air balloon festival in Taitung County, southeast China's Taiwan, July 25, 2019. The 45-day hot air balloon festival opened on June 29.

A hot air balloon pilot and his colleagues pack a hot air balloon during a hot air balloon festival in Taitung County, southeast China's Taiwan, July 25, 2019. The 45-day hot air balloon festival opened on June 29.