求翻译：　　火箭第一级利用大气的空气冷却，然后将其压缩到发动机，与氢气一同燃烧。火箭第二级接着启动，依靠液态氢和少量液态氧，以最高达25马赫的速度驱动飞机进入太空。轨道激动系统(OMS)或反应控制系统(RCS)可以控制推进和飞行高度。“云霄塔”太空飞机采用经过高度绝缘和低温冷冻处理的常用推进剂，这套系统可以在轨道运行最长达7天。是什么意思？

Rocket first level of the air cooling of the atmosphere, and then compressed into the engine, together with the hydrogen burning. The second stage of the rocket then start to rely on liquid hydrogen and a small amount of liquid oxygen up to Mach 25 speed-driven aircraft into space. Orbit excited sys

The first level, the rocket in the atmosphere, cooling the air and then compresses it to the engine with a hydrogen combustion. The first rocket launch, followed by 2 levels rely on liquid hydrogen and liquid oxygen, and a small amount to up to a maximum speed of mach 25 flight drive access to space

The rocket level use atmosphere air cooling, then compresses it the engine, burns together with the hydrogen.The rocket second level then starts, depends upon the liquid state hydrogen and the few liquid oxygen, by high reaches 25 Mach speed actuation airplane to enter the outer space.Orbital excite

Rocket first stage air cooling of the atmosphere, and then compress it into the engine, along with the hydrogen combustion. Rockets went on to start at level II, relies on a small amount of liquid oxygen and liquid hydrogen, to speeds of up to Mach 25-driven aircraft into space. Thrill track system

innovative aerodynamic design;