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"Dual circulation" underlines the need to give full play to the country's hyper-sized domestic market, in order to inject new impetus into the Chinese economy through enhanced domestic circulation. But, it also requires unwavering opening-up to make better use of resources and domestic and overseas markets, Ma said.

"Even if China were successfully to crack down on fentanyl and fentanyl analogs, it would not fix America's opioid problem. Any decrease in Chinese fentanyl production will be offset by a shift in production to one of many other nations with an entrepreneurial, lightly regulated chemical industry that has good connections to the United States.

"Economies have to open up, people have to work, trade has to resume," he said.

"During interviews in rural places, I saw a lot of architecture with ethnic traits, as well as costume, culture and traditional techniques on the verge of extinction as a result of modernization," Liang says.

"Environmental inspection is an important way to make sure vehicles in Beijing meet emissions standards to reduce the city's air pollution," said Lian Aiping, deputy director of the motor vehicle emission management department at the bureau.