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"Demand remains high for them in China compared to other types, as people prefer to use them to buy subway tickets or stamps at vending machines," said Cao Zhanlu, a manager at the Shanghai Mint.

"Economies taking part in the Initiative have two-thirds of the global oil and gas reserves, half of global oil and gas output," he said.

"Disclosure of the manuscript will damage the national security of the United States," it continued.

"Despite the progress made, we can't relax," Gao said. "It is more important to prevent anyone from returning to poverty. Furthermore, we will try our best to help all the residents become well off."

"Every reputable health institution says wearing a mask is one of the most effective things people can do to protect others from contracting COVID-19, especially in places like an aircraft, where social distancing is a challenge," Toby Enqvist, United's chief customer officer, said in a statement.