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A subterranean flow of briny water could rearrange sand grains or alter surface roughness in a way that darkens its appearance.

地下水流的流动会使得沙粒积累，并使得表面变得粗糙，从而颜色更深。

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Sunglint typically lends a bright, or washed out appearance to the water surface.

日斑一般会在水体表面留下明亮的白斑。

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The light absorbed,or collected, by an asbestos surface can be recognized by an appearance all its own.

VOA: special.2009.11.17

There also many different ways to change the appearance of the surface of a textile.

VOA: special.2009.11.04

At each end one of Microsoft's Kinect depth camera sensors is used to track the direction of each person's gaze as well as to capture the shape and appearance of objects placed on the surface and the participant sitting behind them.

BBC: MirageTable demonstration

The overall effect is a surface with a soft, cumulous cloud-like appearance.

NPR: Excerpt: 'A Splintered History Of Wood'

The 20-year-old has a poor record on clay, winning only four of his 13 matches on the slower surface and failing to get beyond the first round of the French Open in his only appearance in 2006.

BBC: Murray 'can be clay-court star'