a chemical substance in petrol, used as a way of measuring its quality 辛烷（汽油中的化学物质，用于检测汽油的质量） high-octane fuel 高辛烷值的燃料
Word Originlate 19th cent.: from octo- ‘eight’ (denoting eight carbon atoms) + -ane.
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octane
Chemical substances used for a specific purpose: agar, antifreeze, antioxidant...
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