In optical recording, a microscopic depression made on the disk surface by the recording laser beam. Recorded information is contained in the pits and the Spaces between pits-lands.

在光记录技术中，由记录激光束在光盘表面上烧蚀的一个微小凹陷区。记录信息包含在凹区和凸区中。

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Dimple eA concave depression found on the surface of a wafer that is visible to the eye under the correct lighting conditions.

表面起伏ꊝ-在合适的光线下通过肉眼可以发现的晶圆片表面凹陷。

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Surface subsidence (ground depression) caused by the overuse of ground water.

过度抽取地下水引起的地面沉降。

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The basin is a large depression in the surface of the land spanning from Minnesota to New York state and including the five Great Lakes: Michigan, Huron, Erie, Superior and Ontario.

NPR: Governors Meet on Access to Great Lakes

There are river channels and flood plains galore on the planet's surface, and even a hemisphere-wide depression that many interpret as an ocean bed.

ECONOMIST: A drought on Mars

But signs that all was not well began to surface when the colourfully-dressed Socialist MSP Rosie Kane took time out to cope with depression.

BBC: The rise and fall of Tommy Sheridan and the left