Photo taken on April 19, 2023 shows student volunteers from Jiangsu University help children learn about Grain Rain, one of the 24 solar terms, at Jiefang Road Kindergarten in Zhenjiang City, Jiangsu Province. The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain, as the last term in spring, starts on April 20 and ends on May 5. (CFP Photo)

Photo taken on April 19, 2023 shows student volunteers from Jiangsu University help children learn about Grain Rain, one of the 24 solar terms, at Jiefang Road Kindergarten in Zhenjiang City, Jiangsu Province. The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain, as the last term in spring, starts on April 20 and ends on May 5. (CFP Photo)

Photo taken on April 19, 2023 shows student volunteers from Jiangsu University help children learn about Grain Rain, one of the 24 solar terms, at Jiefang Road Kindergarten in Zhenjiang City, Jiangsu Province. The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain, as the last term in spring, starts on April 20 and ends on May 5. (CFP Photo)

Photo taken on April 19, 2023 shows student volunteers from Jiangsu University help children learn about Grain Rain, one of the 24 solar terms, at Jiefang Road Kindergarten in Zhenjiang City, Jiangsu Province. The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain, as the last term in spring, starts on April 20 and ends on May 5. (CFP Photo)

Photo taken on April 19, 2023 shows student volunteers from Jiangsu University help children learn about Grain Rain, one of the 24 solar terms, at Jiefang Road Kindergarten in Zhenjiang City, Jiangsu Province. The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain, as the last term in spring, starts on April 20 and ends on May 5. (CFP Photo)