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"China is the second-largest market for the test now, and we'll continue investing in the subscription business as well as the Duolingo English Test," Loh said.

"China has very, very impressive infrastructure — high-speed rail that would be an asset to the United States. But what they have succeeded in doing is going from very, very human capital poor to one of the better educated emerging economies," he said.

"China has made a lot of investment in the top-tier hospitals in urban centers. They have done a lot on medical research. The problem is that there are still great disparities," she says.

"Children who sign up to run can withstand more both from physical and mental perspectives," said the teacher.

"COVID-19 cases are surging and we must take urgent action to flatten the curve now," tweeted Los Angeles mayor Eric Garcetti on Monday.