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European Commission President Ursula von der Leyen (R) shakes hands with Polish Prime Minister Mateusz Morawiecki at the EU headquarters in Brussels, Belgium, Dec. 12, 2019. (Xinhua/Zheng Huansong)

European Commission President Ursula von der Leyen (R) shakes hands with Polish Prime Minister Mateusz Morawiecki at the EU headquarters in Brussels, Belgium, Dec. 12, 2019. (Xinhua/Zheng Huansong)