名词
中文翻译：沙盖
同义词：
['shale', 'sandstone']
例句：
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1.The construction crew used shale to level the ground for the new building.
建筑队使用沙质材料平整了新建筑的土地。
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2.The shale formation is rich in minerals and has been mined for centuries.
这种沙质岩层富含矿物质，数百年来一直被开采。
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3. The shale layer was discovered during a geological survey.
地质调查期间发现了这个沙质岩层。