名词
中文翻译：富油层
同义词：
['rich zone', 'enriched layer', 'oil-rich layer']
例句：
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1.The company's rich coil is a major source of revenue.
该公司的富油层是其主要收入来源。
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2. The geologists found a rich coil in the deep seabed.
地质学家在深海床发现了一个富油层。
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3. The rich coil has been extracted and sold for profit.
这个富油层已经被提取并出售以获利。