Staff members work at a laser refabrication company in Tangshan, north China's Hebei Province, July 19, 2018.

Staff members work at a laser refabrication company in Tangshan, north China's Hebei Province, July 19, 2018.

Staff members work at a laser refabrication company in Tangshan, north China's Hebei Province, July 18, 2018. (Photos: Xinhua)

Staff members work at a laser refabrication company in Tangshan, north China's Hebei Province, July 18, 2018.