当工作流程执行阶段引擎为追踪服务没有关联追踪设定档的工作流程类型要求设定档时，将传回这个新的预设设定档。
SqlTrackingService will return the default tracking profile to the workflow runtime engine for any workflow type for which it doesn't have a tracking profile associated in its database.
通过投射在房间中的网格状红外光点，追踪光点如何反弹并与两个摄像头获得的信息相关联来计算物体移动轨迹。
The movements are calculated by projecting a grid of infrared light spots into a room, tracking how light bounces back, and correlating this with information from the stereo cameras.
在今年春末夏初，零售商开始注意到这些变化，因为他们正在追踪发薪周期与消费的关联。
Retailers started noticing the strain in late spring and early summer as they were monitoring the spending around the paycheck cycle.
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