When this is the case, this technique of tracking state from one join point to be used in a later one is quite helpful.

在出现这种情况时，一个切入点的跟踪状态可以在后一个切入点中使用这项技术就会非常有帮助。

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Only up to a point. Conventional index-tracking has a logical advantage on its side: a value-weighted index represents, by definition, the performance of all investors.

只有达到这么一点，传统的指数跟踪在这方面有一个逻辑优势：按照定义，一个以价值为权重的指数代表所有投资者的业绩。

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The point of tracking your site is to act on the information you gather and use it to improve your web site's effectiveness.

跟踪站点的要点在于在你收集的信息基础上行动，用它来提高你的网站的效力。

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But Nordstrom is quick to point out that the tracking is anonymous, so no worries.

FORBES: How Nordstrom Uses WiFi To Spy On Shoppers

The discussion established that while the B-2 may occasionally be detected by some radars, its stealth technology reduces the radar cross-section of the B-2 to the point where radar tracking of the requisite continuity and accuracy is impossible.

CENTERFORSECURITYPOLICY: Roundtable Discussion On The B-2 Bomber

This AF array is well suited to a wide variety of shooting styles and disciplines, offering AF modes to let users select a single point, continuous AF, Dynamic AF or use 3D tracking to keep pace with a moving subject throughout the frame.

ENGADGET: Nikon unveils lightweight, full-frame D600 DSLR -- hands-on and low-light samples (video)