名词
中文翻译：地层
同义词：
['stratum', 'strata例句：1. The geologist is studying the ground stratum to determine the age of the rocks.（地质学家正在研究地层以确定岩石的年龄。）']
例句：
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1. The geologist is studying the ground stratum to determine the age of the rocks.
地质学家正在研究地层以确定岩石的年龄。
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2. The scientists are analyzing the ground stratum to find out how the earth's crust has formed.
科学家们正在分析地层，以了解地球的地壳是如何形成的。
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3. The archaeologists are excavating the ground stratum to uncover ancient civilizations.
考古学家正在挖掘地层，以揭示古代文明。