If it is hot in summer, milk will go bad if it is left in the car for more than three hours. Pure milk without high-temperature sterilization packaging can be stored for 48 hours at 0℃, but not more than 3 hours at 20℃-30℃, and fresh milk cannot be directly illuminated. There is no air conditioning in the car in summer. In the case of exposure, the temperature inside the car is extremely high, and milk is very easy to deteriorate in the car. If it is fresh milk, it may go bad within 3 hours. If the boxed milk has a shelf life, it can't be directly placed in a high-temperature and dark place, even if it is sterilized at high temperature, it will easily deteriorate within 3 days. So try not to leave food in the car, and take it out when the car stops using. Million car purchase subsidy