1. The rocket was filled with propellent to propel it into space.
火箭被注满了推进剂以将它推向太空。

2. The propellent used in this engine is highly efficient.
该引擎使用的燃料非常高效。

3. The propellent force of the car's engine allowed it to accelerate quickly.
汽车引擎的推动力使其能够快速加速。