oxygen face mask

• 氧气面罩

oxygen face mask的用法和样例：

例句

1. An oxygen mask will come down from overhead in case of emergency.
   如果发生紧急情况，头顶上会放下一只氧气面罩。
2. The car with its whirring air conditioning was like an oxygen mask.
   配备了高功率空调的汽车就像一个氧气面罩。