spur-gear set

例句：

1. 1. The new car has a high-performance propeller set that can accelerate to 60 mph in just 3 seconds.
   这款新车配备了高性能的推进器组，可以在3秒内加速到每小时60英里。
2. 2. The spacecraft's propulsion system is designed to provide continuous thrust for extended mission durations.
   该宇宙飞船的推进系统设计用于提供持续推力，以延长任务持续时间。
3. 3. The engineers carefully assembled the propeller set and tested its performance before launching the spacecraft.
   工程师们仔细组装了推进器组并测试了其性能，然后才将飞船发射升空。