Pupils make pottery wares under the instruction of a volunteer in Cixi City, east China's Zhejiang Province, May 25, 2019. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)

Photo taken on May 25, 2019 shows the pottery wares made by pupils in Cixi City, east China's Zhejiang Province. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)

A pupil makes a pottery ware under the instruction of a volunteer in Cixi City, east China's Zhejiang Province, May 25, 2019. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)

Pupils make pottery wares under the instruction of a volunteer in Cixi City, east China's Zhejiang Province, May 25, 2019. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)

A pupil makes a pottery ware under the instruction of a volunteer in Cixi City, east China's Zhejiang Province, May 25, 2019. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)

Pupils make pottery wares under the instruction of a volunteer in Cixi City, east China's Zhejiang Province, May 25, 2019. A volunteer center in Cixi City opened a pottery class for local pupils in celebration of the upcoming International Children's Day. (Xinhua/Xu Yu)