propellants
n. [航]推进剂（propellant 的复数）
例句
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。
《柯林斯英汉双解大词典》
Typical Assignment: Test burn rates of new propellants.
典型的任务：测试新的推进剂的燃烧率。
However, from what I gather, "hybrid" rocket engines use both solid and liquid or gas propellants.
然而我的理解是，“混合动力”火箭引擎同时使用固体燃料和液态或气态推进剂。
