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Radio-controlled boats are seen during the 24th regatta of radio-controlled sailboats in Sibenik, Croatia, Dec. 15, 2019. (Dusko Jaramaz/Pixsell via Xinhua)
Radio-controlled boats are seen during the 24th regatta of radio-controlled sailboats in Sibenik, Croatia, Dec. 15, 2019. (Dusko Jaramaz/Pixsell via Xinhua)