Don't listen to cold things. Xian Zhen! Those are gimmicks. The most important thing is to keep fresh. Because preservation is very important for refrigerators. The longer the shelf life, the better the quality of the refrigerator. But this does not mean that vegetables or melons are kept in the fresh-keeping room, which means that they will always be fresh. He still has a shelf life. Vegetables and fruits must be within the shelf life, so eat them quickly.
The normal temperature of the refrigerator is within 3-5 degrees, because the fresh-keeping room of the refrigerator is placed there to keep fresh, not for soft freezing. If you put vegetables, it's 3-5 degrees. At this temperature, food can be kept fresh for the longest time, up to 10 days.
But if it reaches 0℃, vegetables will freeze, and the fresh-keeping amount of non-cultivated foods will be different. The zero-degree preservation of refrigerator is mainly controlled by freezing point and low temperature, and the main principle of vacuum preservation is vacuumizing to prevent oxidation.