1. The reaction engine propels the spacecraft forward by expelling hot gases at high speeds.
反应引擎通过以高速排放热气体来推动航天器向前。

2. The reaction engine is a key component of a jet aircraft, providing the thrust needed for flight.
反应引擎是喷气飞机的关键组件，提供飞行所需的推力。

3. The development of more efficient reaction engines has revolutionized the field of aerospace engineering.
更高效的反应引擎的发展改变了航空航天工程领域。

4. Scientists are constantly researching ways to improve the performance of reaction engines.
科学家们不断研究改善反应引擎性能的方法。

5. The spacecraft's reaction engine malfunctioned, causing it to veer off course.
航天器的反应引擎出现故障，导致它偏离了航线。

6. The company is investing in the development of a new generation of reaction engines for space exploration.
该公司正在投资研发用于太空探索的新一代反应引擎。