pre.ig.ni.tion
n.（名词）The ignition of fuel in an internal-combustion engine before the spark passes through the fuel, resulting from a hot spot in the cylinder or from too great a compression ratio for the fuel.提前点火：由内燃机中的火星穿过燃料之前的燃烧，是因油缸热点过高或对燃料的过大压缩比造成的
