free-jet nozzle

例句：

1. 1.The free-jet nozzle in the engine reduces friction and improves efficiency.
   发动机中的自由喷射喷嘴减少了摩擦并提高了效率。
2. 2. The free-jet nozzle is designed to deliver a high-pressure fluid at a consistent rate.
   自由喷射喷嘴被设计用来以恒定速率提供高压流体。
3. 3. The free-jet nozzle was developed to address the issue of low fuel efficiency in diesel engines.
   自由喷射喷嘴的开发是为了解决柴油发动机燃料效率低下的问题。