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  1. 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

    • 更多解釋
    • 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