具有创新思维的零售商正在利用新技术对商店的几乎每个操作进行创新，从库存管理到市场营销再到收款。

Creative retailers are using the new technologies to innovate just about everything stores do, from managing inventory to marketing, to getting paid.

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假设您想重用上面的例子，并加上一个更新产品库存，即减去购物订单中每项产品的产品数量的操作。

Suppose you want to reuse the example above and add another operation that updates the product inventory, decreasing the product quantity for each item in the purchase order.

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第二个操作记录库存水平的变化，此变化是由于商品售出或新进货物引起的：这称为库存动向。

The second operation records a change in inventory levels, either because an item had been sold or new stock has arrived: this is called a stock movement.

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