rocket ramjet

例句：

1. 1.The rocket ramjet is apowerful propulsion system used in spacecraft.
   火箭冲压发动机是用于太空船的一种强大的推进系统。
2. 2. The rocket ramjet was developed to improve the efficiency ofspace travel.
   火箭冲压发动机被开发出来以提高太空旅行的效率。
3. 3. The rocket ramjet has revolutionized the way we thinkabout space exploration.
   火箭冲压发动机已经改变了我们对太空探索的看法。