(190817) -- XINGGUO, Aug. 17, 2019 (Xinhua) -- Yu Yulin, head of a horse caravan, applies medicine to an injured mule in Xingguo County of east China's Jiangxi Province, Aug. 16, 2019. Yu's horse caravan shouldered responsibility recently to convey basic building materials in Xingguo to a collapse site of a pipeline project bringing natural gas from west to the east in the country. The conveying group is made up of 10 people and 22 horses and mules. They play a pivotal role in the job as they conveyed these materials to the hills where modern machinery can not reach. (Xinhua/Hu Chenhuan)