名词
中文翻译：洞穴拱门
同义词：
['cave arch', 'cavern arch', 'cavern archway']
例句：
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1.The cavern arch is a unique feature of this ancient cave system.
这个古代洞穴系统的洞穴拱门是一个独特的特征。
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2.The cavern arch was used as a passageway to connect two sections of the cave.
洞穴拱门被用作连接洞穴两个部分的通道。
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3. The cavern arch is often covered in moss and lichen, making it difficult to see through.
洞穴拱门常常被苔藓和地衣覆盖，使得通过它变得困难。