Chinese Premier Li Keqiang, right, receives the city key of Rio de Janeiro presented by Mayor Eduardo Paes in Rio de Janeiro, Brazil, May 20, 2015. Accepting the key at a presentation ceremony in his hotel, Li said that Chinese products and expertise, such as metro trains and ships, had been of immense public benefit and 皇冠体育app always supported economic cooperation to boost development. [Photo by Liu Zhen/皇冠体育app News Service]
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