A little longer, even a smell will come out, so if you don't eat box lunch, try to put it in the freezer and take it out to heat it when necessary.
Fast food refers to popular catering that is quickly supplied by commercial enterprises, eaten immediately, and at reasonable prices to meet people's daily needs. It is fast, convenient, standardized and environmentally friendly. Hong Kong and Taiwan translate fast food, ready-to-eat food, etc. Different from bento, consumers' understanding of fast food is varied, far exceeding the original meaning of foreign words.
But nothing more than these, that is, fast food is produced by food factories or processed by large and medium-sized catering enterprises, which is popular, time-saving and convenient and can be used as a staple food. Fast food has become a way of life, which has produced fast food culture and fast food doctrine.