Several simple physics problems in the second day of junior high school. But I won't help you. .

1. The water in the basin freezes and gives off heat when it is cold, and the heat is absorbed by the meat. When the temperature of the meat rises, the water inside melts, and the melting absorbs the heat of the water around the meat in the basin, which leads to such a cycle.

2. Sprinkle water on the cover to ensure evaporation and heat absorption and create a cool and cold environment. When the surrounding water vapor reaches this area, it will partially liquefy to ensure the replenishment of water, and then evaporate and circulate, forming a humid environment.