According to Kyushu Drunk Catering Network, the shelf life of sandwiches will not be too long, otherwise they will be easily contaminated by bacteria and moldy. It is generally recommended to eat within 4 hours at room temperature. Leftover sandwiches can be wrapped in plastic wrap and stored in the refrigerator for 2-3 days.
Sandwich is a typical western food, made of two pieces of bread with a few pieces of meat, cheese and various seasonings. It is easy to eat and popular in western countries.