石油由原油和天然气组成，它们似乎来源于海洋沉积物中的有机物质。
Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment.
在炼油厂，从地下提取的原油被分离成天然气、汽油、煤油和各种其他类型的油。
At a refinery, the crude oil from underground is separated into natural gas, gasoline, kerosene, and various oils.
经济低迷正在抑制市场对石油和天然气的需求，导致基准原油价格跌破每桶50美元。
The economic downturn is drying up demand for oil and natural gas, dropping the benchmark price for a barrel of oil to below $50.
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