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"Considering the many weeks of increased disease activity in younger individuals, including almost 50 percent of reported cases occurring among young adults aged 20 to 39 years in recent weeks, there is a very real possibility of the virus reaching higher-risk individuals, populations and settings. As well, with mild and asymptomatic infection occurring more often in younger individuals, it is possible to spread the virus without realizing," said Theresa Tam, Canada's chief public health officer in a statement on Friday.

"Considering a project this big, the investment is intensive and the payoff period is too long, which could introduce many uncertainties to its development," she said.

"Compared with its own development, the value of 5G lies more in the fact that it can empower industries," Liu said.

"Cross-country ski is our national sport; we were born with skis on our feet," he said. "Already China has learned a lot, and the progress is better than I expected at the beginning.

"Consumer goods account for only 15 percent of China's total trade volume, but in developed countries it's 30 to 40 percent," he said.