名词
中文翻译：页岩
同义词：
['shale', 'limestone']
例句：
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1.The papery shale is a type of sedimentary rock that is often used for building houses.
页岩是一种沉积岩，通常用于建造房屋。
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2. The shale formations are important sources of oil and natural gas.
页岩层是石油和天然气的重要来源。
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3. The shale formations have been mined for centuries to extract valuable minerals.
页岩层被开采了数百年，以提取有价值的矿物。