But be careful: a refrigerator is not a cupboard for leftovers. The bacteria in the leftovers are still there at low temperatures, but it is the different types of vegetables that breed different bacteria and reproduce at different rates, and it is very harmful to the body to eat for a long time.
The way to judge food spoilage: judge food spoilage, first look at the color change, purple, yellow-black, brown is generally easy to produce the color of food spoilage. Along with the smell changes, smells like rotten eggs, moldy, acetic acid, amine smell of food to beware.