名词中文翻译
中文翻译：页岩
同义词：
['limestone', 'shale rock']
例句：
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1. The shale layer is richin minerals.
页岩层富含矿物。
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2. Shale is a type of sedimentary rockthat is formed by the compaction oforganic matter.
页岩是一种沉积岩，由有机物质的压实形成。
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3. The shale formation is believed to have been formedover 500 million years ago.
页岩层被认为是在5亿多年前形成的。