词典释义：
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Crude oil is the world's most important commodity.
原油是世界上最重要的商品。
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Thousands of gallons of crude oil were spilled into the ocean.
成千上万加仑的原油泄漏，流进了海洋。
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A thousand tons of crude oil has spilled into the sea from an oil tanker.
1000吨原油从油轮泄漏到了海里。
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The pipeline carries crude oil direct from the oil field to the harbour.
油管把原油从油田直接输往港口。
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Take crude oil as an example.
以原油为例。
原油是一种黑褐色并带有绿色荧光，具有特殊气味的粘稠性油状液体，是烷烃、环烷烃、芳香烃和烯烃等多种液态烃的混合物。 其主要成分是碳和氢两种元素，还有少量的硫、氧、氮和微量的磷、砷、钾、钠、钙、镁、镍、铁、钒等元素。比重0.78～0.97，分子量280～300，凝固点-50～24℃。