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Li called on attending experts to join hands in responding to challenges such as serious diseases, an aging population, environmental pollution and resource shortages, so as to promote sustainable development in the global economy and society, and improve the wellbeing of the world's people.

Secondly, Xi proposed the countries stick to the mutually beneficial cooperation for common prosperity.

Wang Jiangyu, associate professor at the Faculty of Law of the National University of Singapore, said the negotiations between China and the United States will be stronger and more pragmatic after the meeting and the two sides will show more sincerity and seriousness in future talks.

The two leaders also exchanged views on the Korean Peninsula situation and other major international and regional issues.

The Chinese president arrived in Buenos Aires on Thursday night to attend the G20 summit held on Friday and Saturday, and pay a state visit to Argentina.