A mathematical model utilizing inlay method and radiation method was built on the basis of the analysis of cover effect of alarm receiver on alarm system of urban motor vehicles.
根据对市区机动车辆报警系统中报警接收器覆盖效果的分析，应用嵌含法和辐射方法对报警接收器布局建立了数学模型。
In urban areas motor vehicles are a major source of PAHs.
在城市地区机动车辆是多环芳烃的主要来源。
Persistently elevated levels of fine particle pollution are common across many urban areas. Fine particle pollution often originates from combustion sources such as power plants and motor vehicles.
在许多城市区域，常常出现细小颗粒污染程度呈持续性增高情况。细小颗粒污染通常来自发电厂和机动车等燃烧源。
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