There are two ways to preserve food: traditional and modern. Modern methods include canning, dehydration, freezing, vacuum packaging, adding preservatives, lysozyme and so on.

Test analysis: Analyze and answer according to the basic principle of food preservation. Because all kinds of bacteria, fungi and other microorganisms come into contact with food and rely on it to use nutrients in food, they will develop and reproduce, and in the process, they will produce a large number of growth metabolites and produce a variety of flavors, such as acid and odor. Therefore, food spoilage is caused by the growth and mass reproduction of microorganisms. According to the causes of food spoilage, food preservation should try to kill or inhibit the growth and reproduction of microorganisms to avoid food spoilage. Traditional food preservation methods include salting, sugaring, drying and soaking in wine. Modern storage methods mainly include canning, dehydration, freezing, vacuum packaging and adding preservatives. So the description of the topic is correct.