And with head tracking available, placement options are increased: the UI can be placed to the user's side, or above the normal line of sight, for instance.

由于具有头部跟踪可用，需要增加放置选项：比如，UI可以放置到用户的一侧，或在正常视线之上。

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The cutting head equips with automatic tracking system, focusing automatically, responding quickly and accurately.

全自动激光切割头高度跟踪系统，自动对焦、反应灵敏、准确。

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To correct this stop the extra lateral head tracking movement and insist on a reference point farther ahead.

纠正的方法是停止过多的头部平行跟踪移动，坚持更靠前的参考点。

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Head-tracking ensures the position of the player and sends the virtual ball into the right area of the net with each movement.

FORBES: Connect

The head-tracking system, which was developed by the Fraunhofer Heinrich-Hertz Institute in Germany, works by calculating how far away a head is, based on its apparent size (the direction is obvious, of course).

ECONOMIST: Monitor

The company is also (without DFKI) developing a virtual reality environment that uses a pair of active-shutter glasses and a head-tracking camera to let you wander around cave-like structures from the comfort of the lab.

ENGADGET: 'Talking Places' is the Google Glass of tour guides, we go hands-on (video)