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[U] a thick dark smooth liquid from under the ground, used for making petrol and other fuels 石油 The Middle Eastern countries produce most of the world's oil. 全球大部分的石油是中东国家生产的。
We need to do more to reduce our dependence on foreign oil. 我们必须更尽力减少对外国石油的依赖。
Heat can be provided by oil, gas, or electricity. 热能可以由石油、煤气或电来提供。
crude oil (=oil in its natural state) 原油 : A large tanker can carry several million tons of crude oil. 一艘大油轮可运载几百万吨的原油。
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[C/U] a thick smooth liquid used in an engine, so it will work smoothly 机油;润滑油 Change the oil in your car every 3,000 miles. 轿车用的机油每行驶3,000英里要更换一次。
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