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propellant

美国发音:[prə'pelənt]
英国发音:[prə'pelənt] [n]
推进物,推进剂;(枪炮的)发射火药;喷气燃料
〔天〕推进剂
气雾剂的挥发剂
发生剂
喷气发动机燃料
[adj]
推动的

substance, usually gas that drives something, a rocket for example, forward.
A propellant is a thing that propels something, or forces it forward. An explosive for firing a bullet is a propellant. The fuel that fires a rocket is a propellant. Any substance that forces a thing forward is a propellant.