Natural sources can include windblown dust, and soot from wild fires.
天然来源可以包括风沙、烟尘从森林大火。
NEMA 3 - Outdoor use with some protection against windblown dust, rain or sleet.
符合NEMA3—室外，具有一些针对扬尘，雨或雨夹雪的保护利用。
The windblown dust from the Loess Plateau, along with a layer of local coal dust, had settled on her shoes.
风带来了黄土高坡的尘土，掺杂着一层当地的煤粉，落在了她的鞋上。
NEMA 4x - Indoor or Outdoor use with some protection against corrosion, windblown dust or rain, splashing or hose directed water.
符合NEMA4x—室内或室外使用一些防腐蚀，扬尘和雨水，飞溅水或软管直接保护。
There are occasional reports of red, yellow, or black snow falling from the sky, probably due to pollen, windblown dust, or ash and soot.
各地报道称，天空中偶尔会飘落罕见的红色、黄色、黑色雪花，这可能是由于花粉、风吹的尘土或灰烬和烟灰粘在雪上面造成的。
There are occasional reports of red, yellow, or black snow falling from the sky, probably due to pollen, windblown dust, or ash and soot.
各地报道称，天空中偶尔会飘落罕见的红色、黄色、黑色雪花，这可能是由于花粉、风吹的尘土或灰烬和烟灰粘在雪上面造成的。
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