高浓度的混合推进剂中毒时，自由基产生相对减少，机体外周血和肺外器官不发生显著的脂质过氧化损伤。

There is no evidence that the overdose of free radicals is produced and lipid peroxidation occurs when the animals are exposed to high dose of liquid propellant.

youdao

固体燃料火箭发动机的构造更简单、分量更轻，而且相对更安全。 在固体燃料火箭发动机里，燃料和氧化剂被预先混合成稳定的液态推进剂，然后被塞满火箭发动机的燃料箱里。

Solid-fuel rockets, in which the fuel and oxidiser are pre-mixed into a stable, solid propellant and then packed inside the case of the rocket, are simpler, lighter and relatively safer.

youdao

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。

However, from what I gather, "hybrid" rocket engines use both solid and liquid or gas propellants.

youdao