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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This could be achieved with a different mobile, PC or web application that gathers content from a variety of sources.

那就只能使用从多个来源收集内容的另一个移动程序、电脑程序或者网页应用来实现。

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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.

FORBES: How Will Web Profiles Help Grow Instagram?

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