oxygen maskˈoxygen mask noun [countable] 
a piece of equipment that fits over someone’s mouth and nose to provide him or her with oxygen
a piece of equipment that fits over someone’s mouth and nose to provide him or her with oxygen
| 单词 | oxygen mask |
| 释义 | oxygen maskˈoxygen mask noun [countable] a piece of equipment that fits over someone’s mouth and nose to provide him or her with oxygen |
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