飞机上氧气面具只用于紧急情况。

Oxygen masks are used in aircraft only in emergencies.

他为了救那个小孩子戴着氧气面具冲进了着火的房子.

He wore an oxygen mask and rushed into the firing house to save the child.

然后我得了狂躁病, 看那个牙齿矫正医生, 赶快找个氧气面具, 真强!

Then I get manic depressed, see the orthodontist, get gas masks, kick ass.