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Dwindling orders from Europe and other trade partners have sapped China's exports and, combined with a cooling property sector, slowed the country's economic growth rate to 7.6 percent in the second quarter, the lowest level since the first quarter of 2009.

The CSIC will work with related government departments to further push forward the research and development of deep-sea equipment, it said.

Air quality conditions and standards in developed countries are undeniably better. However, this level of quality cannot be achieved without long-term efforts to clean up 100 years of pollution.

The death toll may climb further, as the quakes have seriously damaged telecommunications and traffic infrastructure, making it difficult to collect information, said a spokesman with the provincial civil affairs department.

The Chinese economy expanded only 7.8 percent year on year in the first half of this year, marking the slowest pace in three years and creating substantial pressure for the government to stabilize growth.