Aerial photo taken on June 5, 2021 shows workers harvesting salt at Nanbao salt field in Caofeidian District of Tangshan, north China's Hebei Province. (Xinhua/Yang Shiyao)
Aerial photo taken on June 5, 2021 shows workers harvesting salt at Nanbao salt field in Caofeidian District of Tangshan, north China's Hebei Province.
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