【彩神APP争霸8公安卓app_彩神APP争霸8公安卓app官网】Water Day Picnic held in Warsaw, Poland

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Children and adults have a look at water under a microscope during the Water Day Picnic in Warsaw, Poland, on March 23, 2019. The picnic was held at the Multimedia Fountain Park on the occasion of International Water Day. (Xinhua/Jaap Arriens)

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