摘要：Compared to other manufacturing activities, food production and availability historicallyhas been a seasonal activity dependent on a climatic constraint. The availability of manyperishable agricultural products was limited to a specific time of the year. In manyregions of the world these supply conditions remain. During the last sixty years, aninterstate transportation system and advances in storage, processing, packaging, and coldstorage technologies have transformed U.S. food availability, including perishables, to acontinuous status equaling or surpassing the availability of other manufactured goods.
