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"It was dirty in the past. When it rained, water on the ground became mud. Now even the mineshaft is as clean as a station hall," he says.

"The building of new villages should be integrated with measures to promote production and employment, improve basic public services and protect ethnic, regional and cultural features and styles," Xi said.

With 10 summits already held, the Group of 20 (G20) major economies has "come to a crucial juncture of development," said Xi.

The vice premier stressed China's willingness to boost cooperation in such areas as industrial investment, infrastructure, telecommunications, energy and innovation.

Li suggested Asia-Europe cooperation be guided towards a more pragmatic direction, and economic and trade cooperation be enhanced in particular.