You keep track of multiple keywords in a special document.

保持对一个特殊的文档中多个关键字的跟踪。

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A type of semaphore that is used to track multiple resources of the same type.

一种用来跟踪多个相同类型资源的信号灯。

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Similar to HootSuite, Splitweet is targeted at corporate users who need to both manage multiple accounts and track their results.

类似HootSuite, Splitweet是针对那些需要管理多个帐户并追踪他们的结果的企业用户而建立的。

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And even Loopt shared information that would let a third-party track a user across multiple networks.

FORBES: Watch Out: Check-in Apps Share Your Location With More People Than You Think

Proximo delivers a unique way to track multiple valuables with a last-seen map pin-drop feature, an active proximity dashboard and extended battery life on both its Fob and Tag.

ENGADGET: Kensington wants you to be very afraid of losing your iPhone, buy its $60 Proximo system

Some exchange-traded funds track indexes of stocks across multiple markets.

WSJ: Upside: How to Play Investing's Wild Frontier