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Between 2002 and 2015, Chinese drug regulators approved about 150 new drugs, but in 2017 alone 40 new drugs were approved, and he estimated another 150 new drugs would be approved between 2018 and 2020.

Between January and the start of this month, the capital closed 2,086 polluting companies, affecting more than 36,000 workers, according to the Beijing Municipal Commission of Economy and Information Technology.

Besides Zang, director of the commission's research department, Yue Zhongming, director of its legislative planning department, was also named as the spokesperson.

Biden campaign manager Jen O'Malley Dillon said in a statement that an administrative staffer for the company that charters Biden's campaign plane tested positive on Thursday morning. The staffer flew with Biden to Ohio on Monday and Florida on Tuesday, but O'Malley Dillon says they were always over 50 feet (15 meters) away from Biden, and both wore masks for the entire flight.

Being close to a number of higher education institutions, including Tsinghua and Peking universities, and scientific research establishments, the plaza in Zhongguancun was always crowded with students, teachers and intellectuals looking for books or electronic products.