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Photo taken on May 31, 2019 shows the sewage treatment area of HBIS Group Tangsteel Company in Tangshan, north China's Hebei Province. (Xinhua/Mu Yu)

Photo taken on May 31, 2019 shows the sewage treatment area of HBIS Group Tangsteel Company in Tangshan, north China's Hebei Province. (Xinhua/Mu Yu)