The Spotlight GPS pet locator is a tracking system that lets owners know the moment their dogs make a great escape.

聚光灯GPS宠物定位器是一种跟踪系统，用户在宠物狗进行大逃亡时马上就能知晓。

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At last, it also describes a simulated target generator which is used to test and evaluate the performance of a tracking system.

最后，论文介绍了一种用于测试和评定跟踪系统跟踪性能的模拟目标发生器。

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The group delay specification of a channel is very important for rangingaccuracy of a tracking system and signal quality of a communication channel.

信道的群时延指标对跟踪系统的测量精度和通信系统的信号质量都十分重要。

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She's known for niceties like sending thank you notes, and her office has a tracking system to be sure they are sent out.

WSJ: Giffords Shows Encouraging Responses

The researchers have been working on a tracking system which lets "walkers" dispense with the type of suits used in Hollywood films for motion capture.

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Oxfordshire County Council, which has introduced a tracking system for pupils, has found that there are 122 "lost" pupils, who have disappeared from school this year.

BBC: Pupils 'missing' from school system