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oxygen mask

noun
🔊/ˈɒksɪdʒən mɑːsk/
🔊/ˈɑːksɪdʒən mæsk/
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  1. a device placed over the nose and mouth through which a person can breathe oxygen, for example in an aircraft or a hospital氧气面具；氧气面罩Topics Transport by airc1, Medicinec1