Good afternoon. It is relatively simple to prevent corrosion in the process of pickling vegetables. Just add some food additives, such as sodium dehydroacetate and sodium benzoate. Using potassium sorbate in acidic environment is better for your health. In order to preserve water, it is suggested to add more vegetable oil or animal oil to form a water seal layer on the surface of stewed vegetable soup, which can effectively reduce water loss and make dishes look shiny. Speaking of braised dishes, many of us here are famous for the braised dishes in Jining, Shandong. Their marinated vegetables are not changed for several weeks at a time, and there is no quality problem, which can be used as a reference for your requirements for antibacterial preservation of marinated vegetables.