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oxygen
mastery UK /ˈɒksɪd͡ʒən/ US /ˈɑksɪd͡ʒən/noun
card 1 of 10 · fill in the blank
The patient was struggling to breathe, so the nurse placed an _____ mask on her face.
card 1 of 10 · fill in the blank
The patient was struggling to breathe, so the nurse placed an _____ mask on her face.