Photo taken on July 15, 2017 shows cattle in Shandianhe National Wetland Park in Guyuan county, North China’s Hebei province. [Photo/Xinhua]

Photo taken on July 15, 2017 shows the Shandianhe National Wetland Park in Guyuan county, North China’s Hebei province. [Photo/Xinhua]

Photo taken on July 15, 2017 shows cattle in Shandianhe National Wetland Park in Guyuan county, North China’s Hebei province. [Photo/Xinhua]

Photo taken on July 15, 2017 shows cattle in Shandianhe National Wetland Park in Guyuan county, North China’s Hebei province. [Photo/Xinhua]