1. Fractional distillation of petroleum is carried on in a still. 
   石油的分馏在蒸馏器内进行。
2. an apparatus for the fractional distillation of ethanol from fermentation on an industrial scale. 
   规模生产从氨基酸发酵中分馏蒸馏乙醇的装置。
3. It is not always easy to separate a mixture of liquids into pure substances by fractional distillation. 
   用馏分蒸馏法把液体的混合物分成纯物质，不总是轻而易举的事。
4. A colorless crystalline hydrocarbon, C14H10, obtained by fractional distillation of coal-tar oils and used in dyes, drugs, and explosives. 
   菲一种无色的晶体碳氢化合物，c14h10，通过蒸馏煤焦油而少量地获得，用于染料、药品和炸药
5. A colorless, flammable liquid, C6H14, derived from the fractional distillation of petroleum and used as a solvent and as a working fluid in low-temperature thermometers. 
   已烷一种无色可燃液体，c6h14，从石油的分馏中提取，用作溶剂和低温度气压计中的工作流体

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