An aerial drone photo taken on Oct. 16, 2024 shows a worker operating a machinery harvesting salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows workers transporting harvested salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows a worker operating a machinery harvesting salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial panoramic photo taken on Oct. 16, 2024 shows a view of the Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows workers transporting harvested salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows a view of the Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows a worker operating a machinery harvesting salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows a worker operating a machinery harvesting salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

An aerial drone photo taken on Oct. 16, 2024 shows workers transporting harvested salt at Nanpu salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)

Editors: Zheng Bai, Mi Wenting