0 a piece of equipment that can be put over a person's nose and mouth to supply them with oxygen -- 氧气面具，氧气罩
Tightly fitting oxygen masks are secured at four points by two head straps.
An oxygen mask is provided for each station.
He is now depicted as a bald, gnome-like man wearing a lab coat and an oxygen mask.
She shows us how to put on the oxygen mask and life-jacket, and where the exit doors are.
Wearing oxygen masks the trapped miners were rescued on the 3rd day.
In narrow body airliners, for each row of seats there are overhead oxygen masks and oxygen generators.
The use of oxygen masks that are capable of filtering exhaled particles is gradually becoming a recommended practice for pandemic preparation in many jurisdictions.
The fuselage was unpressurized which meant the paratroopers had to use oxygen masks.
