The slick is somewhat harder to make out in this shot, but this is because of the viewing angle and light conditions, not because the oil slick is dispersing.

这幅照片中的浮油有些难以辨认，这是因为拍摄的角度和光照条件不理想，而不是因为浮油开始消散了。

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Together, the viewing Angle and the clipping planes define what is called the view frustum.

观察角度和切割面共同定义了视域。

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One limiting factor is the viewing Angle, which is comparable to using a camera lens: a telephoto lens has a narrower view than a wide-angle lens.

限制因素之一就是观察角度，这与使用照相机的情况类似：长焦镜头的视野比广角镜头的观察角度要窄得多。

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As with the Tablet PC, the display isn't IPS, per se, but it does have some unspecified wide-angle viewing technology.

ENGADGET: Vizio shows off a 10-inch Tegra 4 tablet and a lower-end 7-inch slate

Vizio says this isn't technically an IPS display, though the panel does make use of some other wide-angle viewing technology (Vizio wouldn't say which one).

ENGADGET: Vizio Tablet PC hands-on (update: now with video) Hands-on

The Back-Up Camera is both dustproof and waterproof to IP67 standard, and features a wide-angle viewing lens that provides a 120-degree viewing area behind the vehicle.

ENGADGET: Wireless Back-Up Camera for the Magellan RoadMate checks your six