Extremely hot summer is expected this year, so if students wear masks, air conditioning is inevitable. Officials advised to refrain from using it because they are concerned that COVID19 can spread in a closed classroom. “The school's air conditioning dilemma. What about the risk of infection?” [Source: Dong-A Ilbo, 5/6] https://www.donga.com/news/Society/article/all/20200506/100926403/1 등교개학 ‘찜통..
