Engine noise is the major noise source of automobile; air power noise is one of composition parts of engine noise.
发动机噪声是汽车的主要噪声源，空气动力噪声是发动机噪声的组成部分之一。
Car service market is the most stable the profit source in the automobile industry chains, which occupied 60 to 70 percent of the total profit.
汽车服务市场是汽车产业链中最稳定的利润来源，可占据总利润的60%至70%。
Since a chief source of pollutants is automobile emissions, it might be expected that pollutant levels could be correlated with automobile traffic, at least to some extent.
因为污染物的主要来源是汽车的排出物，所以可以料想污染物的浓度至少在某种程度上是与汽车运输有关。
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