What do old televisions, street signs, motorbike helmets, windsurf boards, and Christmas trees have in common? They were all caught floating down Amsterdam's Westerdok canal -- by a curtain of bubbles.
원문출처 : https://www.cnn.com/2021/06/08/europe/bubble-barrier-sea-c2e-spc-intl/index.html
원문출처 : https://www.cnn.com/2021/06/08/europe/bubble-barrier-sea-c2e-spc-intl/index.html