Workers work at a saltern in Tangshan City, north China's Hebei Province, July 8, 2018. Sea salt harvest has come to an end in Tangshan City recently, a major production base for sea salt in the country. (Xinhua/Yang Shiyao)

A worker works at a saltern in Tangshan City, north China's Hebei Province, July 8, 2018. Sea salt harvest has come to an end in Tangshan City recently, a major production base for sea salt in the country. (Xinhua/Yang Shiyao)

Workers work at a saltern in Tangshan City, north China's Hebei Province, July 8, 2018. Sea salt harvest has come to an end in Tangshan City recently, a major production base for sea salt in the country. (Xinhua/Yang Shiyao)