octene

例句：

1. 1. The fuel used in the car engine is mainly composed of octane.
   汽车发动机使用的燃料主要是辛烷。
2. 2. The octane number of gasoline is an important indicator of its quality.
   汽油的辛烷值是衡量其质量的重要指标。
3. 3. Octane is a type of petrol that has a higher boiling point and lower volatility than other typesof petrol.
   辛烷是一种沸点较高、挥发性较低的汽油类型。