This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
nanjing hohai university hohaiuniversity china mathematics indoor room Mathematical session in Hohai University Czechs Brazilian and Chinese Nanjing China Mathematical session in Hohai University Czechs Brazilian and Chinese Nanjing China
Page 2023 Free-images.com. All images are Public Domain