Forest rangers patrol at high temperatures on the mountain in Shicheng County, east China's Jiangxi Province, Aug. 18, 2019. Forest rangers fulfilled their duties of protecting the forest around the water source of Ganjiang River, a tributary of the Yangtze, at high temperatures. (Xinhua/Chen Yehua)

　　Aerial photo taken on Aug. 18, 2019 shows forest rangers patrolling at high temperatures on the mountain in Shicheng County, east China's Jiangxi Province. Forest rangers fulfilled their duties of protecting the forest around the water source of Ganjiang River, a tributary of the Yangtze, at high temperatures. (Xinhua/Chen Yehua)

　　Forest rangers clean out weeds on a path at high temperatures on the mountain in Shicheng County, east China's Jiangxi Province, Aug. 18, 2019. Forest rangers fulfilled their duties of protecting the forest around the water source of Ganjiang River, a tributary of the Yangtze, at high temperatures. (Xinhua/Chen Yehua)

　　Forest rangers patrol at high temperatures on the mountain in Shicheng County, east China's Jiangxi Province, Aug. 18, 2019. Forest rangers fulfilled their duties of protecting the forest around the water source of Ganjiang River, a tributary of the Yangtze, at high temperatures. (Xinhua/Chen Yehua)