
A worker inserts a nucleus into a mussel to form a pearl in a cultivation base in Tajiang Village of Wannian County, east China's Jiangxi Province, March 3, 2021. Photo:Xinhua

A worker inserts a nucleus into a mussel to form a pearl in a cultivation base in Tajiang Village of Wannian County, east China's Jiangxi Province, March 3, 2021. Photo:Xinhua

A worker shows a particular pearl in a mussel in a cultivation base in Tajiang Village of Wannian County, east China's Jiangxi Province, March 3, 2021. Photo:Xinhua

A worker gets trained to insert a nucleus into a mussel to form a pearl in a cultivation base in Tajiang Village of Wannian County, east China's Jiangxi Province, March 3, 2021. Photo:Xinhua