The default values in the field would most likely be retrieved from a database or operational system, using the UPC symbol as the key value.
字段中的默认值很可能是通过使用upc符号作为键值从一个数据库或运营系统中检索到的。
UPC-A the Universal Product Code that is widely used in Canada and the United States for tracking trade items in stores.
UPC - A通用产品代码，广泛用于加拿大和美国，用于跟踪商店中的交易物品。
A UPC number consists of a Company Prefix and a Product number.
UPC编号包含公司前缀和产品编号。
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