Photo taken on March 15, 2020 shows a butterfly resting on a flower at a residential site in Songjiang District in east China's Shanghai. (Xinhua/Zhang Jiansong)

A tourist walks on a footpath clustered with flowers at a wetland park in east China's Shanghai, March 15, 2020. (Xinhua/Chen Fei)

Photo taken on March 15, 2020 shows a bee flying among flower branches at a residential site in Songjiang District in east China's Shanghai. (Xinhua/Zhang Jiansong)

Tourists ride on a road clustered with flowers at a wetland park in east China's Shanghai, March 15, 2020. (Xinhua/Chen Fei)

Photo taken on March 15, 2020 shows the spring scenery of Pujiang Country Park in east China's Shanghai. (Xinhua/Wang Xiang)