The hot-air balloons fly to the destination during the 4th H1 China Cross-Qiongzhou Strait Challenge held in Haikou, capital of south China's Hainan province, June 15, 2010. The 4th H1 China Cross-Qiongzhou Strait Challenge kicked off here on Tuesday on which 12 hot-air balloons flied about 28 kilometers and landed at Xuwen County in south China's Guangdong Province in an hour and 20 minutes.[Photo/Xinhua]
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