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Strong measures are required to prevent worsening pollution, and new pollution must be stopped, Li noted, stressing more efforts to make plans to protect unpolluted soil.

Entrepreneurs should have the courage to advance innovation in production organization, technology and market, Xi said, adding that emphasis should be placed on technological research and development and human-capital investment to effectively mobilize employees' creativity and build enterprises into powerful entities of innovation.

Last year, the fourth plenary session of the 19th CPC Central Committee adopted a decision on institution building. Xi said China must use the strength of its institutions to cope with risks and challenges.

China should give scope to human resources, service agencies and internet platform enterprises, and make good use of information technologies such as big data, cloud computing and artificial intelligence to improve employment services, he said.

To this end, he urged giving full scope to enterprises as the main actors in technological innovation, and vigorously cultivating and introducing world-class talent and scientific research teams.