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This design is to keep food fresh without using electricity.
The design is based on the principle of evaporation and
heat absorption. The product is divided into two layers: inside
and outside. Sand is poured into the two layers, and water is added.
Food is placed in the inner layer. The irrigation mouth is covered
with a wet cloth, which can keep food fresh in the ventilated place.
The function of sand is to absorb heat by evaporation. It is placed in
a dry and ventilated place to accelerate air flow and water evaporation.