名词
中文翻译：环形凹陷
同义词：
['annular depression', "annular gap例句：1. The planet's surface is covered in a network of annular concavities.（行星的表面覆盖着一系列环形凹陷。）"]
例句：
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1. The planet's surface is covered in a network of annular concavities.
行星的表面覆盖着一系列环形凹陷。
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2. The moon has many annular concavities that are visible from Earth.
月球有许多环形凹陷，从地球可以看见。
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3. The scientist discovered the annular concavity in the spacecraft's hull.
科学家在飞船的外壳中发现了环形凹陷。