求翻译：Alcohol: a colorless.volatile,flammable liquid, C2H5OH, synthesized or obtained by fermentation of sugars and starches and widely used, either pure of sugars and starches and widely used,either pure or denatured,as a solvent and in drugs, cleaning solutions, explosives, and intoxicating beverages. natural gas: mixture of combustible hydrocarbon gases, mostly methane and ethane, found trapped in the pore spaces of certain sedimentary rocks, often along with petroleum deposits.是什么意思？

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