A worker harvests crude salt at Yanchi Village of Gaotai County in Zhangye city, Northwest China’s Gansu province, Aug 10, 2017.[Photo/Xinhua]

Workers harvest crude salt at Yanchi Village of Gaotai County in Zhangye city, Northwest China’s Gansu province, Aug 10, 2017.[Photo/Xinhua]

Workers harvest crude salt at Yanchi Village of Gaotai County in Zhangye city, Northwest China’s Gansu province, Aug 10, 2017. [Photo/Xinhua]