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Portuguese Foreign Minister Augusto Santos Silva speaks on a conference discussing Portugal's participation in the Belt and Road Initiative in Lisbon, capital of Portugal, on March 23, 2018. (Xinhua/Zhang Liyun)

Portuguese Foreign Minister Augusto Santos Silva speaks on a conference discussing Portugal's participation in the Belt and Road Initiative in Lisbon, capital of Portugal, on March 23, 2018. (Xinhua/Zhang Liyun)