名词
中文翻译：原生沥青
同义词：
['primitive bitumen', 'primary bitumen例句：1. The oil field is rich in protobitumen', 'which can be used as a raw material for the production of petroleum.（油田富含原生沥青，可作为石油生产的原料。）']
例句：
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1. The oil field is rich in protobitumen, which can be used as a raw material for the production of petroleum.
油田富含原生沥青，可作为石油生产的原料。
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2. The protobitumen has been found to have excellent lubricating properties.
研究发现，原生沥青具有极好的润滑性能。
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3. The extraction process of protobitumen requires special equipment and techniques.
原生沥青的提取过程需要特殊的设备和技术。