A worker piles up salt at the Daqinghe sea salt flat in Tangshan, North China’s Hebei province, Oct 30, 2018. [Photo/Xinhua]

A woman works at the Daqinghe sea salt flat in Tangshan, North China’s Hebei province, Oct 30, 2018. [Photo/Xinhua]

Aerial photo taken on Oct 30, 2018 shows a view of the Daqinghe sea salt flat in Tangshan, North China’s Hebei province. [Photo/Xinhua]

Workers collect salt at the Daqinghe sea salt flat in Tangshan, North China’s Hebei province, Oct 30, 2018. [Photo/Xinhua]

Workers collect salt at the Daqinghe sea salt flat in Tangshan, North China’s Hebei province, Oct 30, 2018. [Photo/Xinhua]