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"Cuba hopes to open (its markets) as China has done, and we see this business forum as an opportunity. Tourism is very well developed and we believe that our products will have a great advantage here," he said.

"China still has a lot of opportunities to develop itself. We have a very big and important business here. We double our business in China every five years or so, and we will continue to invest in the largest cities, while expanding in smaller cities."

"China still has much room for improvement in power utilization and the government aims to control waste of renewable power to within a reasonable range in three years," Liu said.

"Commercial guided tours add to the congestion in these identified areas … prevent the free flow of visitor movement and impact public programs and the visitor experience," Jerry Willis, spokesman for NPS, said in a statement. "The restrictions were put in place as a necessary response to the 600 percent increase in commercial tours over the last 10 years.

"Contrary to the common practice of lowering the threshold for user acquisition, such settings ensure the bulk of participants at least understand the norms of the community, which helps the platform hold onto users and enhances their loyalty," said Ma Shicong, an internet analyst with consultancy Analysys.