名词
中文翻译：底层
同义词：
['substratum', 'underlying layer']
例句：
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1.The geological survey revealed an underlying stratum of ancient volcanic activity.
地质调查揭示了一个古老的火山活动下的底层。
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2.The scientist discovered a new species in the underlying stratum of the ocean floor.
科学家在海底的下伏层发现了一种新的物种。
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3. The research team focused on the underlying stratum of the soil to understand its impact on plant growth.
研究团队专注于土壤的下伏层，以了解其对植物生长的影响。