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China's ratio of R&D expenditures to business revenues was 2.27 percent during that period, which is quite high but still lower than many other major economies, he said in an interview. "It means there's still much room for China to further increase its R&D expenditures."

China's top envoy in Washington Cui Tiankai wrote on China-US relations in October that it should be well understood that cooperation is the only path, and problems should be solved through extensive collaboration.

China's photovoltaic industry achieved record high development with new installed systems adding 53.06 GW of capacity to China's solar power industry last year, compared to an increase of 34 GW a year earlier, according to statistics from China's National Energy Administration.

China's railway system will handle around 53 million passenger trips during the four-day Tomb Sweeping Day holiday, according to China Railway, the national operator.

China, as a responsible country, is willing to continue to carry out the deal, fulfill its international obligations and play a constructive role in easing tensions in the Gulf, Wang said.