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"Ties with China are very important, since it is the main buyer of our products," Alberto Padoan, president of the Rosario Board of Trade (BCR), a forum for trade negotiations of agricultural products, told Xinhua.

After concluding the state visit, Xi left Prague on Wednesday for the United States to attend the fourth Nuclear Security Summit, which is to be held in Washington D.C. from March 31 to April 1.

"We welcome the resumption of the Colombo Port City project, and stand ready to work with Sri Lanka to push forward the construction steadily," said Li.

"I really hope the credit rating agencies to have more effective communications with countries rated by them, and come to more comprehensive and objective assessments and judgments of the economic situation of the countries and measures taken by these countries," he said.

Yu also attended a session with the local Chinese community and Chinese expatriates, calling on them to seize the opportunities of cooperation between China and Africa.