Tourists pick shells at a seaside park in Rongcheng City, east China's Shandong Province, July 15, 2018. People enjoy their leisure summer time by getting close to the nature. (Xinhua/Lin Haizhen)

A young boy picks shells at a seaside park in Rongcheng City, east China's Shandong Province, July 15, 2018. People enjoy their leisure summer time by getting close to the nature.(Xinhua/Lin Haizhen)

People visit a cole flower field in Zhangye, northwest China's Gansu Province, July 15, 2018. People enjoy their leisure summer time by getting close to the nature. (Xinhua/Cheng Xuelei)