In areas with heavy automobile traffic, however, the seed germinates in the absence of fire, with automobile exhaust supplying the required nitrogendioxide.
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
Although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogendioxide emissions there have shown only an insignificant decline since 1993.