The liquidfuelrocket, 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。
2
Space programs demand tremendous quantities of liquid hydrogen and oxygen as rocketfuel.
航天计划需要大量的液氢和液氧作为火箭的燃料。
3
To avoid overheating, the mixture in that process in any liquid-fuelrocket is deliberately not optimal.