After a friend posted photos of it on Reddit. com, and readers identified it as a GPS tracker, the FBI showed up at Afifi's apartment demanding he return the device.

他的一个朋友将照片放到了Reddit网上，读者识别出这是一个GPS跟踪器，FBI的人出现在亚瑟·阿菲费的住所，要求他归还那个设备。

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The star tracker is the primary part of airborne celestial navigation device. Random vibration is an important invalidation factor of the star tracker.

星体跟踪器是机载天文导航设备的重要组成部分，随机振动是其结构失效的重要因素。

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After estimation of PRI, the PRI tracker (also called wheel tracker) is designed based on Complex Programmable Logic Device (CPLD).

在PRI参数估计之后，设计了基于可编程逻辑器件(CPLD)的PRI跟踪器(或称为飞轮跟踪器)。

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South Korea's LG is among the latest to join the market with its Smart Activity Tracker - a bracelet device which resembles Nike's bestselling Fuelband.

BBC: CES 2013: Health and safety technology booms

Companies like Withings, which offer an API that syncs with FitBit, just announced a competitive device called the Smart Activity Tracker.

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However, at this point they may not need a tracker: one agent who retrieved the device took the time to list off his favorite restaurants and even congratulated him on his new job.

ENGADGET: American student finds GPS tracker stuck to car, FBI shows up to reclaim its 'federal property'