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The private sector has become the main contributor to job creation and technological innovation and an important source of tax revenue, he said, adding that the sector has played an important role in developing the socialist market economy, transforming government functions, transferring surplus rural labor and exploring the international market.

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.

In science, he set the goal of turning China into one of the world's science centers and an innovation high ground.

The activities that can be developed in cooperation with China range broadly, from aquaculture to mineral resources to ports, said Fernanda Ilheu, president of the New Silk Road Friends Association, a Lisbon-based non-profit think tank.

The China-Europe freight rail services have pushed forward China's opening-up and boosted economic and trade cooperation with countries along the Belt and Road, the China Railway Corporation said in a statement.