这种条形码叫做产品的统一条形码（PC）它的目的是通过使用计算机提高商店的营业速度和效率。

This code is called the universal product code( UPC), It is designed to add speed and efficiency to stores by using computers.

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商店使用计算机跟踪产品和检查你在收银机。

Stores use computers to keep track of products and check you out at the cash register.

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商店使用计算机跟踪产品和检查你在收银机。

Stores use computers to keep track of products and check you out at the cash register.

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