In areas with heavy automobile traffic, however, the seed germinates in the absence of fire, with automobileexhaust supplying the required nitrogen dioxide.
然而，在汽车交通繁忙的地区，种子在没有火灾的情况下借助汽车尾气提供所需的二氧化氮发芽。
2
Automobileexhaust fumes are one of the major caueses of smog.
汽车排出的烟是造成烟雾的主要原因之一。
3
On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobileexhaust.