don't eat in class during the epidemic. You can pack it and take it back in rainy days.

you can't eat directly in the store without eating in class, so you need to pack it and take it back. Because of the epidemic situation in COVID-19, many restaurants can't open their doors. Later, when the epidemic situation eased, they opened their doors. They also banned eating in restaurants or food stalls, so they could only take it home for fear that people would gather to infect COVID-19. Therefore, it is forbidden to eat in restaurants.

in-class food means that it can only be consumed in the store. Hall is a hall, a lobby, where you eat indoors with a roof and a ceiling, which is called hall food for short. It is a professional term to distinguish dining modes in the catering industry. Another meaning of "dining in the hall" is the official meal in the Tang Dynasty government hall, which generally refers to the office meal. Affected by the way and mode of epidemic transmission, relevant departments and businesses will restrict eating in the hall.