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1. Oxford American Dictionary

   nitrous

   • IPA[ˈnītrəs]

   美式

   • adj.
     of or containing nitrogen with a lower valence, often three.；of nitrogen; nitrogenous
2. • 釋義

   adj.

   形容詞

   • 1. of or containing nitrogen with a lower valence, often three.
   • 2. of nitrogen; nitrogenous the effect of nitrous emissions on acid rain