propellant

1. N-MASS Propellant is a substance that causes something to move forward. 推進(jìn)劑

...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. 壓縮氣體

By 1978, the use of CFCs in aerosol propellants was banned. 自1978年起，含氯氟烴的噴霧劑壓縮氣體已被禁止使用。