Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobile sources, mainly automobiles.
空气污染通常是与主要的固定污染源，但排放的最大来源是移动来源主要是汽车。
Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobile sources, mainly automobiles.
空气污染通常是与主要的固定污染源，但排放的最大来源是移动来源主要是汽车。
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