Aerial photo taken on Nov. 4, 2020 shows workers collecting salt in a salt pond at Dongfeng salt field in Qingdao, east China's Shandong Province. Dongfeng salt field has entered the harvest season recently. (Photos: Xinhua)

Aerial photo taken on Nov. 4, 2020 shows workers collecting salt in a salt pond at Dongfeng salt field in Qingdao, east China's Shandong Province. Dongfeng salt field has entered the harvest season recently.

Aerial photo taken on Nov. 4, 2020 shows workers collecting salt in a salt pond at Dongfeng salt field in Qingdao, east China's Shandong Province. Dongfeng salt field has entered the harvest season recently.

Aerial photo taken on Nov. 4, 2020 shows the salt ponds at Dongfeng salt field in Qingdao, east China's Shandong Province. Dongfeng salt field has entered the harvest season recently.

Workers collect salt in a salt pond at Dongfeng salt field in Qingdao, east China's Shandong Province, Nov. 4, 2020. Dongfeng salt field has entered the harvest season recently.