propellant constituent

例句：

1. 1.The development of new propellant materials is crucial for space exploration.
   新型推进剂材料的发展对于太空探索至关重要。
2. 2.The design of the propulsion system is critical to achieving high speed and efficiency.
   推进系统的设计对于实现高速和高效率至关重要。
3. 3.The research on propellant constituents has led to significant advancements in space technology.
   对推进剂成分的研究已经显著推动了太空技术的发展。