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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例如，您可能使用Polling活动在系统中搜索新的销售订单记录，然后自动向会计应用程序发送数据副本以生成帐单。

For example, you might use a Polling activity to search for new sales order records in your system and then automatically send a copy of the data to your accounting application to generate a bill.

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控制中心的工作人员将会联系车主确认车是否真的被盗，然后通过汽车GPS部件记录的车辆动向通知警察。

Staff at the centre will then contact the owner to confirm that the car really is missing, and keep police informed of the vehicle's movements via the car's GPS unit.

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