What does "octane number" mean?

什么是“辛烷值”是什么意思？

Your engine can run happily on 76 octane petrol.

你的发动机很适合烧76号辛烷汽油。

The car pinged when I put in low-octane gasoline.

我加了低辛烷值的汽油之后，汽车经常爆缸。

Octane molecules in gasoline, however, are even more concentrated.

汽油中的辛烷分子浓缩度更高。