Chaoyang industry. Now the warehousing industry is developing very rapidly. With the development of logistics industry in recent years, related industries are bound to usher in an excellent development opportunity. So refrigeration is good. However, refrigeration has a cost problem. If it is completely cooled by electricity, the cost will be high. So now many cold storages are built on the mountain, and caves are dug in the mountain to achieve the effect of constant temperature and humidity. This can greatly reduce the cost. Last year, I visited Shijiazhuang, Qinhuangdao, Chengde and other places in Hebei Province. Many areas are cold storage of this type.

I hope my answer is helpful to you.