字首 Ｏ
單字 oxygen
音標與例句
    音標 [ ˈɑksɪdʒən ]
    Hold the oxygen mask tightly over your nose and mouth.
    把氧氣面罩緊緊地罩住你的鼻子與嘴巴。
    Make sure that the emergency oxygen container is removed.
字義 n.[U]氧氣
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