He has to use an oxygen mask to help him breathe.

他必须戴氧气罩来帮助呼吸。

One of the men placed an oxygen mask over the old cob's head and gave him some oxygen.

一个男人把氧气罩放到老雄天鹅的头上，给他吸氧。

With shaking hands she hooked him up to a drip, and placed an oxygen mask over his face.

她用颤抖的双手给他挂上点滴，然后在他脸上戴上氧气面罩。

I had everything I needed, scuba suit, flippers, mask, oxygen tank, and a poison dart gun.

我有我需要的一切，潜水服、脚蹼、面罩、氧气瓶和毒镖枪。