propellant

1. N-MASS Propellant is a substance that causes something to move forward. 推进剂

...a propellant for nuclear rockets. ...一批核火箭燃料。

2. N-MASS Propellant is a gas that is used in spray cans to force the contents out of the can when you press the button. 压缩气体

By 1978, the use of CFCs in aerosol propellants was banned. 自1978年起，含氯氟烃的喷雾剂压缩气体已被禁止使用。