A meaningful sound track is often as complicated as the image on the screen, and is ultimately just as much the responsibility of the director.

一个有意义的音轨往往和屏幕上的图像一样复杂，从根本上来说，它和导演的责任同样重大。

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That's because the glasses are wired to position and orientation sensors that track the wearer's gaze, and the system USES this information to alter the image accordingly in real time for each user.

这是因为眼镜可以定位并且有方向感应器可以追踪佩戴者的目光，然后系统根据这些信息来改变每个用户相应的实时图像。

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If the image is coupled with the patient's details and location, the system could also help track the spread of a disease through the population, he says.

他还说，如果图像上附带了患者的详细资料及所在位置，系统还能够帮助跟踪出疾病传染的人口范围。

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It once took days for image buyers to track down the perfect still life with strawberries.

FORBES: Image Enhancement

No matter which option you choose, you'll still be able to access the usual menu in which you can create a new document or upload an image, music track or voice recording.

ENGADGET: Google Drive preview: an in-depth look at features and functionality

Mr Williams said he had no urge to try and track down the image that caught his imagination but was not against the idea of seeing it again.

BBC: Soldier Number 2