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"Dual-circulation" does not mean seclusion under the domestic circulation model, but instead emphasizes further opening-up of the economy and bolstering ties with other nations, a senior economist said.

"Everyone comes to the airport to be somewhere else," he said.

"Did it come out of the virology lab in Wuhan, did it occur in the wet market there in Wuhan or did it occur somewhere else? And the answer to that is we don't know," the top US military officer told reporters in a Pentagon briefing when asked about the origin of COVID-19.

"Faster delivery frees up working capital and reduces capital costs, and rail transport also offers a much greener alternative to air transport for the most time-sensitive trade flows."

"Even as women have gained equality in access to education and work, decisions on having more children are constrained by their 'second shift' in taking care of children and managing households," said Won Do-yeon, chief of the UNFPA's Seoul office, in an email interview with Reuters.