PHOTO / CHINA
Taking the test
Published: Jun 04, 2025 10:29 PM
A volunteer from Jiangsu University demonstrates and explains how to test the acidity and alkalinity of water to primary school students in Zhenjiang, East China's Jiangsu Province on June 4, 2025, one day ahead of World Environment Day, which falls on June 5. Photo: VCG

A volunteer from Jiangsu University demonstrates and explains how to test the acidity and alkalinity of water to primary school students in Zhenjiang, East China's Jiangsu Province on June 4, 2025, one day ahead of World Environment Day, which falls on June 5. Photo: VCG