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(190903) -- LISBON, Sept. 3, 2019 (Xinhua) -- Portugal's forward Cristiano Ronaldo eyes on the ball during Portugal's national football team training session ahead of the UEFA EURO 2020 qualifying round Group B matches against Serbia and Lithuania at Cidade do Futebol (Football City) training camp in Oeiras, outskirts of Lisbon, Portugal, Sept. 3, 2019. (Photo by Pedro Fiuza/Xinhua)