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1. Oxford American Dictionary

   brown cloud

   • n.
     a visible pall of air pollutants that persists over a city or other area

   • noun: brown cloud, plural noun: brown clouds

2. • 釋義

   n.

   名詞

   • 1. a visible pall of air pollutants that persists over a city or other area the Asian brown cloud throughout the day, air shifts in the valley cause variances in the brown cloud