Beijing, August 20 (Xinhua) NBC Business Channel 19 Daily said that recently, a number of U.S. colleges and universities in the United States after the resumption of classes has outbreak of new epidemic. The head of a Yale School of accommodation said students should be prepared for widespread infection and even death on campus. < p > < p > it is reported that the University of North Carolina at Chapel Hill announced on the 18th local time that all undergraduate courses would be transferred to the Internet one week after the resumption of classes due to the outbreak of the new crown disease among students. Notre Dame University in South Bend, on Lake Michigan, Indiana, reported at least 222 new crown confirmed cases on campus, nearly 80 more than the 18 days after the suspension. The University said on the 18th that due to the outbreak, the University cancelled all its in-school courses and transferred all its teaching to the Internet for at least two weeks when it reassessed its security policy. U.S. health experts say it may take several years for students to return to school, especially among primary school-age children. However, to achieve this goal, it is necessary to combine group immunization, new coronal vaccine and health measures. Experts warn that it may take years for students and teachers in the United States to return to school safely without masks and social distance. < / P > < p > according to the Yale Daily News 18, Santos, head of Yale’s silyman School of accommodation, said in an email to students in July that their dormitories this fall may be different than before, and students “should be emotionally prepared, and your life on campus will look more like a hospital than a residential school School “.