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"Digitalization will be a core factor to help drive a quality growth for China's industrial development. Chinese companies, such as Mino, has been actively engaged in development of digital business," said Wang Haibin, executive vice-president and general manager of Digital Factory Division, Siemens Ltd, China.

"Ecological conservation concerns the future of the humankind, and it's the common goal of all nations to build a green home," Xi said in the letter.

"E-commerce can help construct a more convenient custom clearance, modernized logistics and ideal investment environment," said Wang Jinzhen, vice-chairman of the China Council for the Promotion of International Trade, at the Public-Private Partnership Forum on BRICS E-commerce.

"External forces are the biggest threat and what the central authorities find most unacceptable because they are behind the violent protesters, offering them help and financial resources. The central authorities are very worried, and are strongly determined to prohibit collusion with external forces to meddle in Hong Kong's internal affairs."

"Every 20 minutes you're on a screen, take a break and focus on something that is at least 20 feet away for 20 seconds before going back to what you are doing," Chen said.