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"Everybody can sell air purifiers when you have PM2.5 at 300 outside for two weeks, because it does not need a great company to achieve that," said Frank Hammes, CEO of Swiss air purification provider IQAir.

"Family is the basic cell of society and the first school of our life," Xi said. No matter how time has changed, the family value, family education and family building must be stressed so that the millions of families become important points for national development, ethnical progress and social harmony, he added.

"Expectations for next year's infrastructure spending are not as pessimistic as some people have predicted, at least the trend is unlikely to be the same compared with this year's," said the official with the fixed-asset department of the National Development and Reform Commission, who declined to be identified due to lack of authority to speak to the media.

"Exports to China are very limited compared with the imports ... China is a large country with a very large population and the exhibition is an opportunity to increase our exports to China," she said.

"During the authentication process, we provide bank branches with training, to help them set up customer-centric business models and systems of service quality management," said Nie Liqin, deputy general manager of the China Financial Authentication.