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"Given most of our users are adults who have limited time for learning each day, we are scrambling to leverage more technologies to fill up their excess time," said Liu.

"Financial activities for the public, whether in the name of technology or not, should be strictly regulated, and we should safeguard residents' money," he said in his speech.

"From the very beginning of this pandemic, we put the health and safety of the American people first," DNC Chairman Tom Perez said in a statement.

"GM's growth in China is a result of working with our trusted joint venture partners," the statement said. "We will continue to work with our partners to provide high-quality products and services to consumers."

"Guidance needs to change and needs to be clear that these nonmedical, nonsurgical masks are beneficial to the general public and should be worn when outside of the home," Robert Hecht, a professor of epidemiology at the Yale University School of Public Health, said in an article published Monday on politico.com.