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(190904) -- ALGIERS, Sept. 4, 2019 (Xinhua) -- The image of the emblem of the 22nd FIFA World Cup is seen on the wall of the Algiers Opera in Algiers, Algeria, on Sept. 3 2019. The official unveiling took place in Qatar's capital Doha on Tuesday. A number of cities around the world also celebrated the event. (Xinhua)