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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Complex terrain of network design, dust source points sealed design and the choice of devices, mobile sources dust-dust control and grass control are the key link.

复杂地形的管网设计，尘源点的密封装置的设计和选用，移动尘源的粉尘扩散控制以及二次扬尘的控制是整个工程中的重点和难点。

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The report covers 181 air toxics and diesel particulate matter and estimates risks from exposure to emissions from industrial sources and mobile sources such as cars and trucks.

这份报告涵盖了181种空气毒物和内燃机颗粒物，并且估计了暴露于工业源和移动源例如汽车和卡车的排放物的风险。

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The EPA actually began regulating mobile GHG sources first as the trigger for applying permitting programs under their interpretation of the CAA to stationary sources.

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Traditional web growth sources are a bit different from mobile app growth sources e.g. app store SEO is much different than web SEO, and both offer some level of growth potential.

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He points to logistics companies, major retailers and mobile telecommunications as sources of innovation in non-financial services, and to genetically modified seeds as the most prominent example in agriculture.

ECONOMIST: Economics focus