Tsinghua University said 15.3 percent of last year's graduates went abroad to study, down 1.2 percentage points from 2018 and 1.7 percentage points from 2017.
Truck drivers have also been put under strict management, with most foreign drivers entering and leaving China on the same day. Transport companies are encouraged to monitor truck drivers and constantly conduct nucleic acid tests on them, Liu said.
Trump, who is facing a tough re-election battle in November, is scheduled to attend a "Students for Trump" event in Phoenix on Tuesday.
Trump said on a news conference last Thursday that Pyongyang wanted the sanctions lifted in their entirety, while DPRK Foreign Minister Ri Yong-ho said they had only demanded a partial easing in exchange for dismantling its main nuclear site at Yongbyon.
Trump re-opened debate on two of those issues in a tweet Thursday. He claimed?Amazon pays little to no taxes to local governments and accused the company of using USPS as its personal “Delivery Boy (causing tremendous loss to the U.S.)”
Trump's pitch comes as several lawsuits accusing the president of violating the US Constitution's emoluments clause, which bans gifts from foreign governments, wind their way through the courts.
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Trump threatened Monday to impose tariffs on imports from Argentina and Brazil and accused the nations of devaluing their currencies to undercut US products in international markets.
Trump has been refusing to wear a mask himself since the pandemic broke out, citing his good health and frequent negative tests for the virus. "I have no problem with a mask. I don't think you need one when you're tested all the time, everybody around you is tested, you're quite a distance," he said on Thursday.
Trump's words came one day after Pyongyang released a series of positive signals over the denuclearization of the Korean Peninsula.
Trump has been repeatedly complaining that US allies exploited his country on defense spending. In his remarks to graduates of the United States Military Academy over the weekend, Trump emphasized the US military is not the policemen of the world.