Freezers are electrical equipment used to store food or other items. Generally, there are two types: single-layer and multi-layer. For multi-layer freezers, in order to better preserve different kinds of food, they need to be placed in layers. The following are several common layering methods for freezers:

1. Classified storage. Store different kinds of food separately, such as meat, fruits and vegetables in different levels to avoid food mixing and cross-contamination.

2. Store according to density. Put high-density food at the bottom and low-density food at the top, so that you can make maximum use of space to store different kinds of food.

3. Store according to the frequency of use. Put commonly used food in an easy-to-get position, and put uncommon food in a difficult-to-get position for use. For example, put breakfast food at the top, lunch food in the middle and dinner food at the bottom.

4. Store on demand. Put the food that is about to expire or will be used at the front so as not to be forgotten.

5. Store by size. Large food is placed at the bottom, and small food is placed at the top or at the door to increase the storage space.

In tiered storage, we should also pay attention to:

1. Keep the air circulation in the freezer to avoid interference between foods.

2. Try to avoid food exposure and cross-contamination of food.

3. Clean the food and dust in the freezer regularly to ensure the hygiene and safety of food.

In short, the correct layering method can make rational use of freezer space, better preserve food, reduce cross-contamination and make food safer and healthier.