| 单词 | 灰岩 |
| 释义 | 〔sinkhole〕A natural depression in a land surface communicating with a subterranean passage, generally occurring in limestone regions and formed by solution or by collapse of a cavern roof.灰岩坑：与某一地下通道相联的陆地表面的自然下沉地区，通常出现在灰岩地区并且由石灰岩溶解成溶洞顶部下沉形成〔chert〕A siliceous rock of chalcedonic or opaline silica occurring in limestone.硅石：出现在灰岩中的玉髓或蛋白色硅石〔coquina〕A soft, porous limestone, composed essentially of fragments of shells and coral, used as a building material.贝壳灰岩：一种质软、多孔的灰岩，基本上由贝壳及珊瑚的碎片构成，用作建筑材料 |
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