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After purchasing fresh fruits and vegetables, remove the dirt and yellow leaves, then wrap them in plastic wrap and put them in the refrigerator. There are four advantages to this: one is to reduce the source of external pollution, the other is to protect the vitamins in fruits and vegetables, the third is to prevent the taste of the fragrance from escaping other foods, and the fourth is to reduce the contact with oxygen, which is conducive to preservation. Food entering the freezer is afraid of repeated freezing and thawing, because freezing and thawing will destroy the structure of the cells, increase the chance of corruption, and affect the taste of the food. Therefore, it is necessary to pre-package the food according to the amount of food consumed each time, wrap it in a thick and dry plastic bag and then put it into the freezer.