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。
Main source of protein and iron in our diet 日常饮食中蛋白质及铁质的主要来源。
Milk is the major source of calcium for babies 牛奶是婴儿获取钙质的主要来源。
Analysis of the system ' s main source of noise 分析了系统中噪声的主要来源。
Analysis on teachers burnout ' origin and its resolvents 教师职业压力的主要来源及纾解
My wages are the principal source of my income 薪金是我收入的主要来源。
Major sources of george eliot ' s thought 乔治183 ;爱略特思想的主要来源
The tourist trade is the country ' s main source of income 旅游业是这个国家收入的主要来源。
That has been a major source of heartburn for educators 对教育者来说，这是伤痛的主要来源。
Main source : coal - fired power plants and automobile exhaust 主要来源：汽车尾气和燃煤发电厂。
