fire retardant, 阻燃劑

A jet aerial tanker drops its load of fire retardant on a fire near Pollack Pines, California, Sept. 15, 2014. The fire has consumed more than 3,000 acres and forced the evacuation of dozens of homes.
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September 16, 2014
http://www.voanews.com/media/photogallery/september-16-2014-day-in-photos/2451755.html

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