当一个用户变更订单或当企业改变价格时，我们不能认为这些动作是正常流程的一部分，因此它们与实体(如订单)的生命周期无关。
When a customer changes the order or when the business changes a price, we cannot consider these actions part of the normal flow, so they are not associated with the entity (such as order) lifecycle.
与此里程碑关联的其他动作可能在正常运营期间发生，而并不只是出现在发生异常时。
Other actions associated with the milestone may take place during normal operations, and not only when an exception occurs.
例如，如果用户不注意将计算机放在尚未拉好的计算机包中，则需要计算机检测到正常行走或开车的动作，并关闭计算机。
For example, if the user inadvertently places the computer in a laptop bag still turned on, we want the computer to detect a normal walking or driving motion and turn the computer off.
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