hard propellant的用法和樣例：
例句
- We shall try by means of a highly simplified development to expose certain advantages and disadvantages of solid propellant rocket systems.
我們想通過(guò)相當簡(jiǎn)單的推導來(lái)試圖闡明固體推進(jìn)劑火箭系統的某些優(yōu)缺點(diǎn)。 - The pasty propellant is a new kind of chemical propellant derived from solid propellant.
膏體推進(jìn)劑是由固體推進(jìn)劑衍變而成的一種新型化學(xué)推進(jìn)劑。
