| 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 |
| 随便看 |
|
学习网英语词汇栏目收词371507余条，连同派生词、复合词、词组和习语等。每个词条提供了音标、词性、释义、用法、搭配和同（近）义词等多项功能，对所收词汇进行全方位的解释和说明，内容丰富，功能全面。