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China will comprehensively promote consumption to further tap its potential in supporting economic development while maintaining stable macroeconomic policies to anchor market expectations, said a senior official on Friday.

China is willing to promote development, maintain security and share results with other countries in the field of artificial intelligence, President Xi Jinping said on Monday in a congratulatory letter at the start of a gathering in Shanghai that has drawn some of the world's top AI luminaries.

China saw shrinking output of refined copper in May, which fell by 5.2 percent to reach 711,000 tons.

China now has more researchers than the United States, outspends the European Union in research and development and "is on track to beat all other nations in its yearly production of scientific papers", the renowned scientific magazine Nature reported.

China will bolster online information consumption in the next few years to stimulate domestic demand and shore up economic growth.