Photo taken on Nov. 27, 2018 shows banners of the G20 summit in Buenos Aires, Argentina. The 13th G20 summit, under the theme of Building Consensus for Fair and Sustainable Development, will be held for the first time in a South American country from Friday to Saturday. (Xinhua/Li Ming)

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Staff members install a signboard outside the Costa Salguero Center in Buenos Aires, Argentina, on Nov. 27, 2018. The 13th G20 summit, under the theme of Building Consensus for Fair and Sustainable Development, will be held for the first time in a South American country from Friday to Saturday. (Xinhua/Wang Pei)