It takes 4 days to place an order from Kunming to Shanghai.

Cold chain refers to the procurement, processing, sterilization and inactivation of some food raw materials, processed foods or semi-finished products, special biological products and drugs. In the process of processing, storage, transportation, distribution and use of products, all links are always in the special low-temperature environment necessary for products to reduce losses, prevent pollution and deterioration, and ensure food safety, biological safety and drug safety of products.