Another unconventional design element, the hybrid rocket engine that powers the suborbital vehicle, provides unique operational options. 另一个异于传统的设计要素,是提供次轨道载具动力的混合式火箭引擎,它能提供独特的操作选择。
For one thing, they simplify the design of a rocket engine. 首先,它们可以简化火箭发动机的设计。
Rocket motors have many advantages over other forms of propulsion. 火箭发动机比其他推进器有许多优点。