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1. Oxford Dictionary

   nitrogen dioxide

   • IPA[ˌnʌɪtrədʒ(ə)n dʌɪˈɒksʌɪd]

   英式

   • n.
     a reddish-brown poisonous gas occurring commonly as an air pollutant, formed by the oxidation of nitric oxide or by combustion in the presence of air. Below 21°C nitrogen dioxide is a yellowish-brown liquid.

   • noun: nitrogen dioxide

2. • 更多解釋

   nitrogen dioxide

   • IPA[ˈnītrəjən dīˈäkˌsīd]

   美式

   • n.
     a reddish-brown poisonous gas occurring commonly as an air pollutant, formed by the oxidation ...

   Oxford American Dictionary