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1. Oxford Dictionary

   oxygen mask

   英式

   • n.
     a mask placed over the nose and mouth and connected to a supply of oxygen, used when the body is not able to gain enough oxygen by breathing air, for example at high altitudes, or because of a medical condition.

   • noun: oxygen mask, plural noun: oxygen masks

2. • 更多解釋

   oxygen mask

   • IPA[ˈäksəjən mask]

   美式

   • n.
     a mask placed over the nose and mouth and connected to a supply of oxygen, used when the body ...

   Oxford American Dictionary