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Two visitors walk downstairs outside the Alte Nationalgalerie (Old National Gallery) at Museum Island in Berlin, capital of Germany, on May 17, 2019. (Xinhua/Shan Yuqi)
Two visitors walk downstairs outside the Alte Nationalgalerie (Old National Gallery) at Museum Island in Berlin, capital of Germany, on May 17, 2019. (Xinhua/Shan Yuqi)