One day, the elder brother received an incompressible post box.

一天，哥哥收到一个缩的邮箱。

But low-octane engines don’t compress enough for high-octane fuels, and there isn’t enough time between the spark and the gas being swept out of the chamber for all that fuel to be used up.

但是低辛值发动机缩足够的高辛值燃料，而且在火花和气体被扫出燃烧室之间没有足够的时间让所有燃料都用完。