it will be difficult. Pure milk for catering is specially designed for the catering industry and sold at a fixed point. The difference between ordinary milk and Uno's special milk is mainly in nutritional components, such as protein, fat, lactose, calcium, etc., and there are also subtle differences in individual micronutrients. The content of unsaturated fatty acids in Uno catering milk is higher than that in ordinary milk, and the content of linoleic acid and trace elements such as copper, zinc and selenium in ordinary milk is higher than that in Uno catering milk. Theoretically, the antibiotic residue in ordinary milk may be higher than that in catering milk. However, the main harm of antibiotic residues is to promote the emergence of bacterial resistance, which is not directly harmful to individuals.