To avoid overheating, the mixture in that process in any liquid-fuel rocket is deliberately not optimal.

为了避免过热，因为在任何液体燃料火箭进程的混合物故意不理想。

youdao

The liquid fuel rocket, which is continually being improved, is used in aircraft as well as for research in the upper air and for putting earth satellites into orbits.

液态燃料火箭不断得到改进，它用在飞行器上，也被用来研究高层大气和把地球卫星送入轨道。

youdao

Space programs demand tremendous quantities of liquid hydrogen and oxygen as rocket fuel.

航天计划需要大量的液氢和液氧作为火箭的燃料。

youdao

Liquid-fuelled rocket engines work by mixing the fuel (in this case kerosene) with liquid oxygen at high pressure.

ECONOMIST: On a rotor-blade and a prayer | The

The term hybrid is used because this type of rocket motor uses neither all-liquid fuel nor all-solid fuel, but a combination of both.

BBC: Hybrid success for British rocket