How to preserve steamed bowls in Xi 'an Restaurant?

Now it's like natural freezing all night, generally like something in northern China for the New Year. Basically, it is enough to put them outside the window and cover them with something. Basically, they won't be said to be broken. Well, it's also a traditional custom. If you put it in the refrigerator, whether it is frozen or refrigerated is another question, so besides that, you may not be able to put it well, so it is recommended to put it directly outside when it is below zero in winter, and there is not enough time. Generally, the longest shelf life in the refrigerator is about 15 days, depending on the specific components of the drug. Some Chinese medicines are perishable and will go bad in less than 15 days, so it is almost certain that they will go bad in one month, and the effect will be discounted. "