| 单词 | natural cement |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔sandstone〕A sedimentary rock formed by the consolidation and compaction of sand and held together by a natural cement, such as silica.砂岩：一种由砂固化与压积作用形成的沉积岩，通过自然胶结物粘到一起，如硅石美国传统 |
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