The HLDI tracks per-car theft losses and reports loss results in relative terms.

HLDI 跟踪平均汽车丢失，然后报告丢失相对数值结果。

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On each side, a disk is divided into circular regions called tracks. A floppy disk has either 40 or 80 tracks per side.

软盘每一面上划分成的环形区域叫作道。软盘分每面40道和80道两种。

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The main circuits of a magnetic head positioning system with a density of 8 tracks per millimeter (TPM) based on a 4 TPM system are described with the performance of the system analysed and discussed.

本文介绍了一个磁道密度为每毫米八道的磁头定位系统，该系统是将每毫米四道的系统加以改进而得。文中给出了该系统的主要电路，并对系统的性能进行了分析和讨论。

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As customers respond, the program tracks the cost per lead for each campaign and graphs the results.

FORBES: Junk Mail Bytes It

Based on information provided to the Equine Injury Database, horses suffered fatal breakdowns at a rate of 1.3 per 1, 000 on synthetic tracks, 1.6 per 1, 000 on grass courses, and more than 2 per 1, 000 on dirt.

FORBES: Making Racing Safer For Horses, Starting With The Surface

The money will be used to upgrade tracks in the northeast so Acela trains can run up to 160 miles per hour on some New Jersey and Pennsylvania tracks (it now rarely exceeds 70 miles per hour), and build a new spur through Queens, so Boston-bound trains can travel on separate tracks from New York commuter trains.

BBC: The futurist: Putting the choo-choo back in Chattanooga